NAUI Scuba Diver Practice exam

The maximum dive time for a dive to 65 feet of seawater is indeed 45 minutes. This is based on standard dive tables or recreational dive planners that provide no-decompression limits, which are guidelines primarily aimed at preventing decompression sickness.

At 65 feet, the pressure is about 3.1 atmospheres (1 atmosphere being the pressure at sea level). Prolonged exposure to this depth increases the risk of nitrogen absorption, and the time limit helps ensure that divers can safely ascend without the need for decompression stops.

Choosing a maximum dive time of 45 minutes allows divers sufficient time to explore while also maintaining safety protocols established by training organizations like NAUI. Following these guidelines helps mitigate the risks associated with deeper and longer dives while ensuring a safe and enjoyable diving experience.