Subsurface is a dive log program. The user can download dive information directly from a large number of supported dive computers. Subsurface is able to track multi-tank dives with air, Nitrox, or TriMix, weights and exposure protection used, dive masters, and dive buddies, and allows the user to rate dives and provide additional dive notes. It calculates a wide variety of statistics of the user’s diving and calculates and tracks information like SAC rate or OTU. Subsurface allows the user to print out a detailed log book including dive profiles and other relevant information.