How long can you drive with a rebreather?
A single fill of a small gas cylinder or cylinders and CO2 scrubber can last for anywhere from one to six hours, depending on which rebreather it is. Unlike open-circuit scuba, your gas duration on a rebreather is nearly independent of depth, so you could, in theory, spend all that time on the bottom.
Navy SEALs can hold their breath underwater for two to three minutes or more.
Are rebreathers worth it?
Although rebreathers are frequently thought of as best used in technical diving, I feel they have greatly enhanced my recreational diving as well.” … But ask any rebreather diver — especially the experts tapped here — and they’ll tell you it’s totally worth it.
What is the longest dive?
The longest scuba dive in a controlled environment lasted 192 hours, 19 minutes 19 seconds.
Are rebreathers safe?
With the caveat that they are “best guess numbers,” Fock concluded that rebreather diving is likely five to 10 times as risky as open circuit scuba diving, accounting for about four to five deaths per 100,000 dives, compared to about 0.4 to 0.5 deaths per 100,000 dives for open circuit scuba.
In 2012, German freediver Tom Sietas held his breath underwater for 22 minutes and 22 seconds, besting Dane Stig Severinsen’s previous Guinness record by 22 seconds. (Although Guinness still lists Severinsen as the record holder, stating he hyperventilated with oxygen before his attempt for 19 minutes and 30 seconds.)