. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Author Dr. Harris B. Stewart, Jr. in wet suit preparing for dive. (Right) Swimmer Sled ca- pable of speeds up to 2'/2 knots and depths of 150 feet, carrying two divers. can leave you confused. In some instances this totally unworldly effect has led to sheer panic. Learn of it and enjoy it. It is one of the many new sensations you will discover in ocean diving. In most of our offshore areas within div- ing depth there is a current over and above the
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Author Dr. Harris B. Stewart, Jr. in wet suit preparing for dive. (Right) Swimmer Sled ca- pable of speeds up to 2'/2 knots and depths of 150 feet, carrying two divers. can leave you confused. In some instances this totally unworldly effect has led to sheer panic. Learn of it and enjoy it. It is one of the many new sensations you will discover in ocean diving. In most of our offshore areas within div- ing depth there is a current over and above the surge related to waves moving overhead. In places like the Santa Barbara Channel off California, these currents can be so strong that a diver hanging onto a rock outcrop at fifty feet finds himself waving like a flag. If you have a tending boat overhead — and it is a lot safer to have someone up there whose sole purpose in life is monitoring your and your fellow diver's bubbles — pop up and tell the man in the boat that you are encountering strong currents to the east so that he will know which way to move to follow you. It is quite probable that he is in a different regime of currents and has the additional problem of wind and that the boat is not drifting the same way that you are, some fifty feet below him. If currents in a dive are strong to the east, this is no in- dication that they will be the same when you go back to the same diving area the next week. Off most of our coasts, we have fairly strong tidal currents that change direction with time, so you will have to check the cur- rent direction each time you dive. Even though the surface water may be warm as you enter it, the temperature at depth will probably be considerably colder. Most offshore areas have what oceanogra- phers call a thermocline. This is an area where there is a relatively rapid decrease in water temperature with increasing depth. Know what the local temperature regime is, and dress accordingly. Y
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