[cdavis]

Thought about this a little more.

Your challenge, when you get into dolphins, will be maintaining sufficient surface interval to support the max possible bottom time. 30 seconds is going to seem like 10 eternities with a couple of dolphin right below you. If you go back down too quick, like 1 minute or less , you will not have restored your 02 or C02 mechanisms even though you may feel ready to dive. Makes for the next dive being not relaxed, too short and uncomfortable. You will be very tempted to hyperventilate, get your C02 down quickly and go. That doesn't work and too much of it can put you in BO territory (not real likely for a semi-beginner, but worth considering). Before you get into dolphins, experiment with dives that look like what you expect to do with them plus different surface intervals. Everybody is different, but you will probably find that a surface interval slightly over 2 minutes will get you the most bottom time. You may find that dives of longer that 1 minute are quite possible if you relax (no small trick with dolphins around) and extend the interval. A 3 to 1 ratio works pretty well for longer dives in that kind of depth.

Good Luck and bring us a report when you get back

Connor