What is TBT in the context of diving?

In the context of diving, TBT stands for Total Bottom Time, which is a critical concept for divers to understand in relation to dive planning and safety. Total Bottom Time is calculated as the sum of the actual time spent at depth during a dive, excluding ascent and descent times. It is essential for managing exposure to pressure and nitrogen absorption, helping divers avoid decompression sickness.

By managing TBT effectively, divers can ensure that their overall exposure to the underwater environment remains within safe parameters, allowing for enjoyable and safe diving experiences. This understanding aids in calculating no-decompression limits and planning dives accordingly, making it a fundamental aspect of safe dive practices.