The SEALAB project was an ambitious initiative launched by the United States Navy to explore the possibilities of underwater living and research. SEALAB III, the third and most advanced of the series, was designed to allow scientists to live and work on the ocean floor for extended periods. On February 17, Berry L. Cannon, an American aquanaut, was engaged in repair work within the habitat when a critical leak occurred. As he attempted to seal the breach, he was exposed to elevated levels of carbon dioxide, which led to his tragic demise. Despite the rigorous safety training and protocols established, the event underscored the inherent risks of underwater operations.The SEALAB III was located off the coast of La Jolla, California, at a depth of 205 feet. Cannon was not only a skilled technician but also a key part of the groundbreaking efforts in underwater habitats. The loss of Cannon had an immediate impact on the SEALAB team, bringing morale to a low point and prompting an internal review of safety measures. Following the incident, the Navy assessed the viability of continuing with the SEALAB project, ultimately leading to its cancellation. The project, which inspired a generation of underwater research, faced significant scrutiny regarding its safety and the potential for human error in extreme conditions.