Increasing temperatures allow deeper active layer depths, resulting in increased water infiltration. Paleobathymetry is the study of past underwater depths. Almost nothing was known of the ocean depths. Some species are adapted to the cold, ocean depths. While feeding, ringed seals dive to depths of . Whales carry nutrients such as nitrogen from the depths back to the surface. Squats can be performed to varying depths. Few unmanned submersibles are capable of descending to maximum hadal depths. This is due to the fact that the temperature and salinity varies at different depths. The average penetration depths achieved with this process ranges from . Their main advantage lies in the possibility of reaching higher depths (up to 80m). These are capable of operating in water depths up to . They are capable of constructing piles to depths of up to . There he is alone with God whose voice echoes in his depths. TLPs are used in water depths up to about .