Posted by Maciek on September 26, 2002 at 14:02:15:
In Reply to: you may be absolutely right posted by Karl S. on September 26, 2002 at 11:04:06:
Do you mind to share how do you make sure depth is exactly 15 feet and 1 inch?
Why is 15 feet and one inch minimizing the risk to student and instructor? What about 16 feet? or 14 feet? which is a bigger risk?