Relax!!! Sounds like your getting worked up already and youre Not in the water yet! Which is not a good thing to do! Ask your Instructor as to how deep,and any other questions you have, thats what theyre there for. My classes as I remember we were in the shallow end of the pool (3 ft) then we moved on to the deep end (10 ft), then on our check outs they were all open water, ocean, we didnt go over 20 ft.and there was no boat dive all shore 5 dives. Every Instructor could do his/her class different, thats why ask Your Instuctor. And remember..... Relax, have fun! Dive safe! Good Luck in your classes!!