Grumpy Old Geeks Topics Scuba certification Topic Scuba certification 3 mentions in 1 episode The training Jason describes, including swimming tests and underwater mask exercises. Mentions 140: Rapid Unscheduled Disassembly Dec 18, 2015 7:11 I was getting my scuba certification. 9:07 You tread water for 10 minutes. 10:48 You have to completely take your mask off, put it back on and get all the water out.