These were: the number of days since a diver's last dive, location of original certification, awareness and understanding of marine park zoning (3 variables), site selection, use of photographic equipment, total number of dives logged and diving depth.
We use previously published data from a leatherback turtle from French Guiana [9] to illustrate the ZOC procedure for divers with subtle diurnal patterns in diving depth, and alternating dives with large differences in shape and depth [9].
The maximum diving depth is unknown, but crocodiles can dive to at least 20 m.
The deployment of capillary depth recorders, which record the maximum dive depth undertaken by a bird (between attaching it to a bird and recovering it when it returns to land), has shown that while some species, like the wandering albatross, do not dive deeper than a metre, some species, like the light-mantled albatross, have a mean diving depth of almost 5 m and can dive as deep as 12.5 m.
Diving behaviour of king penguins displays a diurnal pattern, whereby penguins rarely dive below 40 m during the night, but diving depth may exceed 200 m during the day [13], [14].
Throughout the North Atlantic mean diving depth was significantly correlated with the depth of the thermocline, and dive behavior changed in relation to the stratification of the water column.
Particular design on mechanical seal and compressive strength is implemented to achieve large diving depth.
For example, the Los Angeles class was said to have sacrificed some diving depth in order to achieve higher speed.
As exemplified in the submarine forces of the United States, Britain, and the Soviet Union, these three trends were increased speed, increased diving depth, and silencing.
It has been proposed that physical activity in diving may enhance antioxidant activity5, but studies supporting this hypothesis are lacking; little is known on how production of free radicals depends on the diving depth, cold temperature, the duration of exposure to high pressure environment, and in particular the kind of gas breathed.
It's never quite clear what happens to parts of the platform that are below diving depth, or why this junk has to be removed when, on the East Coast, old subway cars are tossed into the ocean to become artificial reefs.
