Navy SEALs, like other divers, utilize specialized equipment to remain submerged for extended periods. This typically involves open-circuit scuba systems, closed-circuit rebreathers, or for very short durations, compressed air devices. Open-circuit scuba allows exhaled air to escape as bubbles, while closed-circuit rebreathers recycle exhaled breath, removing carbon dioxide and replenishing oxygen. The latter offers the advantage of longer dive times and reduced bubble trails, crucial for stealth operations. Specific equipment choices depend on mission parameters.
The ability to operate underwater without detection provides a significant tactical advantage in various naval operations. From reconnaissance and surveillance to infiltration and demolition, underwater capabilities enable SEALs to approach targets undetected and complete missions critical to national security. The historical development of underwater breathing apparatus has been instrumental in shaping modern naval special warfare tactics.