^ Your fear of not being able to touch the bottom reminds me of the swim call we had at the Equator. As he was announcing it over the intercom/1MC, the QMOW (Quartermaster of the Watch) said:
"Now, swim call, swim call, swim call on the starboard side. Temperature of the air is 98 deg; Temperature of the water is 95 deg; Depth of the water is.... (long pause)... uhh, 3 MILES!!"
(Sorry, just had to be there, as it was hilarious in pacing.)