No Mercury pressure suit ever failed during launch. No manned Mercury capsule ever lost pressure during a mission, so the suits never needed to be inflated after launch. The only suit-related incident was an uncapped ventilation inlet valve which almost led to the drowning of astronaut Gus Grissom: at the end of the MR-4 mission the hatch cover blew off while in the Atlantic Ocean and the capsule began to fill with water, forcing Grissom to make an emergency exit without securing his suit for the recovery operations. The most frequent suit complaints of the astronauts were discomfort due to poor temperature control, and inability to turn the head within the pressurized suit.