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A Head Filled With Seawater: Remembering Liberty Bell 7, Six Decades On

One of the U.S. Marine Corps helicopters fruitlessly attempts to raise Liberty Bell 7 from the Atlantic Ocean. Unbeknownst to their crew, Virgil “Gus” Grissom was close to drowning. Photo Credit: NASA

Sixty years ago today, America sent its second astronaut beyond the limit of Earth’s “sensible” atmosphere and into the airless ether of space. Virgil “Gus” Grissom—who went on to become the first man to log two spaceflights, before dying in the Apollo 1 tragedy—launched atop a converted Redstone ballistic missile from Cape Canaveral in Florida at 7:20 a.m. EST on 21 July 1961, rose in his Liberty Bell 7 capsule to an apogee of 118 miles (190 km), then splashed down in the Atlantic Ocean only 15 minutes later. It was America’s second suborbital mission, following Alan Shepard’s pioneering Freedom 7 flight the previous May, but even at this early juncture Liberty Bell 7 revealed the true dangers of human space exploration and Grissom narrowly escaped with his life.

Video Credit: NASA, via lunarmodule5/YouTube

Hailing from the Midwestern town of Mitchell, Ind., Grissom was small as a child, but his diminutive stature endowed him with a desire to “prove I could do things as well as the big boys”. He established himself as a Boy Scout, leading the honor guard, later delivering newspapers and picking peaches and cherries for local growers, in order to earn enough money to date his high school sweetheart, Betty Moore.

Grissom served as an aviation cadet, but World War Two ended before he could see action. He worked installing doors on school buses, then studied mechanical engineering at Purdue University, flipping burgers at night in a local diner whilst Betty—now his wife—worked as a long-distance operator. Years later, Grissom would credit Betty with making his success possible.

In later life, Grissom would credit his wife, Betty—seen here during the Liberty Bell 7 post-flight news conference—with making his success possible. Photo Credit: NASA

Upon receipt of his degree, he re-enlisted in the Air Force, won his wings and was deployed to the Korean theater of war, where he flew a hundred combat missions in the sleek F-86 Sabre jet. An interesting tale from this period recalls the pilots riding in an old school bus from the hangar to the flight line. Only the pilots who had been involved in air-to-air combat were allowed to sit; the uninitiated had to stand. Grissom stood only once.

After the war, he served as an instructor pilot and was selected for test pilot school at the fabled Edwards Air Force Base, Calif., earning repute as one of the best “jet jockies” in the service. In April 1959, alongside six others—including Shepard and the man who became America’s first man in orbit, John Glenn—he was chosen as one of the “Original Seven” Mercury astronauts. But it was the moniker of “astronaut” that Grissom hated most. “I’m not ass-anything,” he growled. “I’m a pilot. Isn’t that good enough?”

Grissom, pictured during emergency water egress training in 1961, prior to his Liberty Bell 7 mission. Photo Credit: NASA

His Liberty Bell 7 mission on 21 July 1961, on the face of it, seemed a virtual carbon copy of Shepard’s Freedom 7 suborbital “hop”, but in fact the two flights were poles apart. For starters, Liberty Bell 7 was the first of its kind to boast a large, trapezoid window, instead of two tiny portholes, which improved his field of view. A makeshift urine collector was also aboard, as was an explosively actuated side hatch.

Early plans had called for the astronaut to exit the craft through an antenna compartment in the capsule’s nose, but this was so awkward that two hatches were developed: one manual, one explosive. The hatch was held in place by 70 titanium bolts, each a quarter-inch (6.5 millimeters) in diameter, and a mechanical version was flown on Shepard’s mission. However, it was three times heavier than its explosive counterpart. As a consequence, the explosive hatch was to be trialed on Grissom’s mission. It was a decision which almost proved fatal.

Video Credit: Purdue University/YouTube

The explosive hatch contained a mild detonating fuse, installed in a channel between an inner and outer seal around the edge of the hatch. When fired, the gas pressure between the two seals fractured each of the 70 bolts and blew off the hatch. Small holes, drilled into each bolt, provided “weak points” and aided the fracturing process. The fuse could be triggered manually by the astronaut, using a plunger near his right arm, or from outside the capsule by an external lanyard. The performance of the hatch on Liberty Bell 7 would, in some eyes, tarnish Grissom’s reputation for the rest of his life.

During training, Grissom established his reputation as a “hands-on” pilot, attending meetings, supervising the engineering work and “fretting a little over whether all of the critical parts would arrive from the subcontractors on time and get put together”. Among his concerns were mistakenly switched instruments, which caused the spacecraft to yaw to the left instead of the right, and the failure of the attitude controls, which did not properly center themselves after maneuvers.

Years later, Grissom would live to regret the painting of a large white crack on the side of Liberty Bell 7. Photo Credit: NASA

Throughout June 1961, nagging problems were encountered with his pressure suit and the spacecraft’s rusted clock needed replacement. To ensure that he did not take himself out of the running for the mission, Grissom gave up water-skiing and calmed down his raucous exploits in his Corvette. As souvenirs for the flight, he took two rolls of Mercury dimes—a hundred in all—which he stuffed into the pocket of his suit. It was a decision that he would later live to regret.

Grissom’s selection as the prime pilot for Liberty Bell 7 was ratified on 15 July 1961 and launch was scheduled for the 18th. Part of what was becoming traditional was naming the capsule. Grissom’s choice honored the famous Liberty Bell, today housed in Philadelphia, Penn., and considered one of the most important symbols of the American War of Independence. The Bell epitomizes freedom, nationhood, and the abolition of slavery. Cast in 1751, its most famous ringing supposedly summoned Philadelphia’s citizenry for a reading of the Declaration of Independence.

Grissom approaches the gantry and his Redstone rocket at Cape Canaveral’s Pad 5. Photo Credit: NASA

When questioned, Grissom explained that the bell’s message of freedom and similarity of shape with the spacecraft had influenced his decision. To further honor the original bell—which cracked during its first ringing, was repaired, cracked again in 1846, and was eventually rendered unusable—it was decided to paint a large white fracture along the side of the spacegoing Liberty Bell. “No one seemed quite sure what the crack looked like,” said Grissom, “so we copied it from the tails side of a 50-cent piece.”

On 17 July, the day before the planned launch, Grissom and his backup, astronaut John Glenn, relaxed in the crew quarters at Cape Canaveral’s Hangar S. Late that same night, the launch was scrubbed by low cloud cover. This decision was taken before the lengthy procedure of loading the Redstone booster with liquid oxygen had begun. This meant that only a 24-hour delay, as opposed to a 48-hour stand-down, would be necessary. Physician Bill Douglas woke Grissom at 1:10 a.m. EST on 19 July and informed him that the scheduled launch time had been moved up by an hour, to 7 a.m., in the hope that the mission could be underway before a spell of bad weather settled over the Cape.

Clad in his silver pressure suit, Grissom confers with backup pilot John Glenn in the hours before the 19 July launch attempt. It was later scrubbed due to poor weather conditions. Photo Credit: NASA

The plan was for Grissom to eat breakfast and undergo a physical examination. Unfortunately, the astronaut recalled later, “someone forgot to pass the word about the earlier launch time, because breakfast was not ready at 1:45 a.m. as it was supposed to be.” After the now-customary procedure of gluing sensors to his body, Grissom was helped into his pressure suit and, at 4:15 a.m., clambered into the white transfer van.

Despite the presence of cloudy skies along the entire Atlantic coast, “from Canaveral on north,” the astronaut was given the go-ahead at 5 a.m. to board his spacecraft. To alleviate any boredom, Douglas handed Grissom a crossword book. The countdown, though, proceeded normally, albeit with a keen eye on the weather, until T-10 minutes, when the clock was stopped in the hope that conditions might improve.

They didn’t.

Grissom checks his flight plan inside Liberty Bell 7 on the morning of 21 July 1961. Photo Credit: NASA

The launch was scrubbed and, since the Redstone had been fully loaded, a 48-hour turnaround was now unavoidable. Early on 21 July, Grissom again suited-up and headed out to the launch pad. Delay after delay hit the countdown: firstly, one of the 70 titanium bolts around the rim of the hatch became cross-threaded, then the pad’s searchlights had to be switched off to avoid interfering with telemetry from the rocket. All the while, cloud cover was given the opportunity to move away from the launch area. The astronaut, meanwhile, spoke briefly to his wife, did deep-breathing exercises, and flexed his arms and legs so as not to become too stiff.

Finally, at 7:20:36 a.m. EST, Liberty Bell 7 lifted off.

Passing through the sound barrier, the Redstone’s engine shut down, as planned, 142 seconds after liftoff. Grissom felt a “brief tumbling sensation” at this stage and would later describe the clear sound of the escape tower being jettisoned. Two minutes after launch, he saw the sky turn rapidly from dark blue to black. He also noticed what he believed to be a faint star, roughly equally as bright as Polaris, but which actually turned out to be the planet Venus; this won him a steak dinner from John Glenn, who had bet him that he would not be able to see any stars or planets.

Liberty Bell 7 launches at 7:20 a.m. EST on 21 July 1961. Photo Credit: NASA

Observing Earth proved more difficult. Cloud cover over the Gulf of Mexico between Apalachiocola, Fla., and Mobile, Ala., made it virtually impossible for him to discern any land. Still, Grissom was granted a fascinating glimpse through the trapezoid window. “I could make out brilliant gradations of color,” he said, “the blue of the water, the white of the beaches, and the brown of the land.”

Re-entry posed no significant problems, with the exception that it gave Grissom the peculiar sensation that he had reversed his backward flight through space and was actually moving face-forward. Plummeting toward the Atlantic, he saw what appeared to be the spent retrorockets passing the periscope view. Nine minutes and 41 seconds after launch, the drogue chute deployed, slowing Liberty Bell 7, before the descent was arrested by the jolt of the main canopy. “The capsule started to rotate and swing slowly under the chute as it descended,” he said later. “I could feel a slight jar as the landing bag dropped down to take up some of the shock.”

Spacecraft communicators John Glenn and Gordon Cooper listen to the progress of the flight from the Mission Control station at Cape Canaveral. Photo Credit: NASA

In spite of a small tear in the main canopy, it did its job, and the spacecraft impacted the Atlantic at 7:35 a.m., completing a mission of 15 minutes and 37 seconds—barely nine seconds longer than Shepard’s flight—with what Grissom described as “a good bump.” After splashdown, it nosed underwater, with the astronaut lying on his left side with his head down, but slowly righted itself as the impact skirt filled with water and acted as a sea anchor.

He disconnected his oxygen inlet hose, unfastened his helmet from his suit, released the chest strap, lap belt and shoulder harness, and, finally, detached his biosensors. At first, he considered not bothering to unroll a rubber neck dam to keep air in and water out of his suit. “It’s a chore to secure the dam,” he said of the device, “and I didn’t think I’d need it. Fortunately, I reconsidered.”

Spectacular view of Earth, as seen by Grissom through Liberty Bell 7’s trapezoidal window. Photo Credit: NASA

As Grissom moved smartly through his post-landing checks, a quartet of Sikovsky UH-34D helicopters, dispatched from the recovery ship U.S.S. Randolph, were already on the scene. One of their crews, Jim Lewis and John Rinehard, was tasked with raising Liberty Bell 7 from the water, after which the astronaut would blow the hatch, exit the capsule and be winched aboard the chopper. Seconds after splashdown, Grissom radioed Lewis, callsigned “Hunt Club 1”, to ask for a few minutes to finish marking switch positions. Finally, after confirming that he was ready to be picked up, he lay back in his couch and waited.

All at once, “I heard the hatch blow—the noise was a dull thud—and looked up to see blue sky…and water start to spill over the doorsill.” The ocean was calm, but Mercury capsules were not designed for seaworthiness (particularly with an open hatch) and Liberty Bell 7 started to wobble and flood. Grissom, who later admitted that he had “never moved faster” in his life, dropped his helmet, grabbed the right side of the instrument panel, jumped into the water and swam furiously. “The next thing I knew,” he said, “I was floating high in my suit with the water up to my armpits.”

This was one of the final views of Liberty Bell 7 on 21 July 1961, before it was lost beneath the waves of the Atlantic Ocean. Not until 1999, more than three decades after Grissom’s death, would the sunken capsule be returned to the surface. Photo Credit: NASA

Although both cap and safety pin were off the detonator, Grissom later explained that he did not believe he had hit the button to manually blow the hatch. “The capsule was rocking around a little, but there weren’t any loose items…so I don’t know how I could have hit it, but possibly I did,” he told a debriefing that morning aboard the Randolph. Lewis had to dip his helicopter’s three wheels into the water to allow Rinehard to hook a cable onto the now-sinking Liberty Bell 7. “Fortunately,” Lewis recounted, “the first time John tried, he managed to hook-up while the capsule was totally submerged.”

Grissom, now in the water, was puzzled, anxious, then angry, when the helicopter did not lower a horse collar to hoist him aboard.

Lewis, whose own training had shown him that Mercury pressure suits “floated very well” and had seen the astronauts apparently enjoying their time in the water, had no idea that Grissom was in fact close to drowning. The astronaut had inadvertently left open an oxygen inlet connection, which allowed water to seep into his suit and air to leak out. Although he closed the inlet, some air also seeped from the neck dam, causing him to sink lower and regret the weight of souvenirs in his pockets.

The U.S.S. Randolph is visible in the distance, as helicopters wrestle with Grissom’s capsule. Photo Credit: NASA

Grissom did not know that Lewis was himself struggling with the spacecraft: in addition to the waterlogged capsule, Liberty Bell 7’s landing bag had filled with seawater and it now weighed in excess of 4,400 pounds (2,000 kg)—some 1,100 pounds (500 kg) more than the helicopter was designed to lift.

Although Lewis felt he could generate sufficient lift to raise Liberty Bell 7 and take it back to the Randolph, every time he pulled it clear of the water and it drained, a swell would rise and fill the capsule again. Lewis’ instruments told him that the strain on the engine would allow him only five minutes in the air before it cut out. He therefore released the capsule to sink in 17,700 feet (5,400 meters) of water and requested that another chopper fish Grissom from the water while he nursed his own aircraft back to the ship.

This view of U.S. Marine Corps and U.S. Navy helicopters grappling with Liberty Bell 7 reveals how close to the wire the recovery effort was. Photo Credit: NASA

Unaware of the difficulties the astronaut was having—they assumed that his frantic waving was to assure them that he was fine—it was several more minutes before the second helicopter, with George Cox aboard, dropped him a horse collar, which he looped around his neck and arms (albeit backwards) and lifted him to safety. Grissom was so exhausted that he could not even remember the helicopter had dragged him across the water before he finally started ascending. He had been in the water for only four or five minutes, “although it seemed like an eternity.”

His first request upon arrival on the Randolph’s deck was for something to blow his nose, as his head was full of seawater. A congratulatory call from President John F. Kennedy fell on deaf ears as, for the first time, “my aircraft and I had not come back together. In my entire career as a pilot, Liberty Bell 7 was the first thing I had ever lost.”

Soaked and exhausted, Grissom chats over the telephone with President John F. Kennedy from the deck of the U.S.S. Randolph. Photo Credit: NASA

Worse was to come. At his first post-mission press conference, and in the years to follow, Grissom would be grilled by journalists, not over the success of his mission, but over the festering question of whether he had contributed to the loss of his spacecraft by blowing the hatch. It was an accusation that Grissom would refute till the day he died.

Not surprisingly, his temperature and heart rate were both high when he arrived aboard the Randolph. Physicians described him as “tired and … breathing rapidly; his skin was warm and moist.” Years later, in his book The Right Stuff, Tom Wolfe pointed to his physiological state as “evidence” that he had panicked inside Liberty Bell 7…even though Grissom was known to have an abnormally high heart rate.

Alongside John Young for Gemini 3 in March 1965, Grissom became the first human to enter space twice. Photo Credit: NASA

Even the astronaut himself, at his first post-flight press conference in Cocoa Beach’s Starlight Motel, admitted that he was “scared” during liftoff, an admission later leapt upon by the media as proof that America’s second spaceman had a chink of weakness. Test pilots at Edwards Air Force Base scornfully mocked that Grissom had “screwed the pooch” and his sons were lambasted by their schoolmates for the loss of the capsule.

In his own recollection for Life magazine, Grissom admitted that “if a guy isn’t a little frightened by a trip into space, he’s abnormal”.

Backdropped by a training version of their Block 1 command module, Apollo 1 astronauts Ed White, Gus Grissom and Roger Chaffee confer before a water egress training exercise in the Gulf of Mexico in October 1966. Photo Credit: NASA

A subsequent investigation from August to October 1961, which included fellow Mercury astronaut Wally Schirra, determined that the astronaut did not contribute to the detonation of the hatch. Indeed, said Schirra, “there was only a very remote possibility that the plunger could have been actuated inadvertently by the pilot”. During the inquiry, a fully-suited Schirra wriggled into a Mercury simulator and, no matter how hard he tried, he was unable to “accidentally” trigger the hatch’s detonator.

One of the conclusions was that a balloon would be installed in future capsules to allow recovery ships to pick up the spacecraft if the helicopters were forced to drop them. Many other engineers and managers shared the astronauts’ conviction that Grissom was blameless. However, the stigma refused to go away. Some engineers continued to mutter of “a transient malfunction”, but had no way to identify it because the evidence lay on the floor of the Atlantic. Not until 1999 was Liberty Bell 7 salvaged and raised to the surface.

Video Credit: Nate Spielman/YouTube

Grissom participated exhaustively in the investigation. “I even crawled into capsules and tried to duplicate all of my movements,” he said, “to see if I could make the whole thing happen again. It was impossible. The plunger that detonates the bolts is so far out of the way that I would have had to reach for it on purpose to hit it…and this I did not do. Even when I thrashed about with my elbows, I could not bump against it accidentally.”

Moreover, to hit the plunger manually would have required sufficient force to produce a nasty bruise, which Grissom did not have. Possibilities included the omission of the ring seal on the detonator’s plunger, static electricity from the helicopter, a change of temperature of the exterior lanyard after splashdown or—a hypothesis that Grissom supported—the entanglement of the lanyard with the straps of the landing bag.

Recovered from the Atlantic Ocean in 1999, Liberty Bell 7 now resides in the Kansas Cosmosphere and Space Center in Hutchinson, Kansas. Photo Credit: John Karpiej/Historicspacecraft.com

Certainly, launch pad leader Guenter Wendt fiercely discounted all of these theories but one: the entanglement of the exterior lanyard. “It is the most logical explanation,” he said. “Can we prove it? No.” It is a pity that the mishap—however it happened—should have, in the eyes of the public, marred what had otherwise been a hugely successful mission and which cleared the way for John Glenn’s historic orbital flight in February 1962.

Was the unfortunate, twice-cracked Liberty Bell to blame for its space-flying namesake’s watery demise? All Grissom would ever say was that Liberty Bell 7 “was the last capsule we would ever launch with a crack in it!”

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Written by Ben Evans

2 Comments

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  1. Excellent piece of space history. I believe the film canister from this flight was not retrieved/opened because of the danger of explosion. Can you shed some light on that?

    Also, it is my understanding that had he lived, Grissom was slated to be the first man to walk on the Moon as he was favored by Deke Slayton.

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