SEALAB III was a US Navy project aiming to explore deep-sea living. Tragically, divers faced numerous technical problems, leading to the death of a diver, Barry Cannon. The initial investigation blamed a faulty CO2 scrubber, but new evidence suggests electrocution as the cause. The project suffered from poor planning, lack of experienced personnel, and equipment failures, ultimately halting the ambitious underwater living experiment. This incident highlights the critical importance of communication and rigorous safety standards in scuba diving operations.