Dennis K. Graver Quotes & Sayings
Enjoy the top 1 famous quotes, sayings and quotations by Dennis K. Graver.
Famous Quotes By Dennis K. Graver
The recommended practice is to stop for five minutes at half of the deepest depth to which you have been diving and to stop again at a depth of 15 to 20 feet (4.5 to 6.1 m) for five minutes before surfacing. — Dennis K. Graver