:: As far as surviving bad weather at sea, I suggest a boat that can detect bad weather and submerge to a safe depth until it passes . talk ) 08 : 04, 3 December 2013 ( UTC)
12.
That day, at 1340, " William Ward Burrows "'rudder touched a 3-fathom ( 5 m ) coral head in an area believed to have been dredged to a safe depth of 30 feet ( 5 fm; 9 m ).
13.
The RAN recalled the " Collins "-class submarines to base after the incident, and after engineers were unable to determine the flaw in the pipes that caused the incident, instructed that the maximum safe depth of the class be reduced.
14.
Even a 10-degree angle on the 339-foot-long hull would cause a difference in depth of the bow and stern, and 30 degrees would produce, which meant that while the stern would almost be on the surface, the bow would almost be at its maximum safe depth.
15.
As " Stickleback " was going to a safe depth, she lost power and broached approximately ahead of the destroyer escort . " Silverstein " backed full and put her rudder hard left in an effort to avoid a collision but holed the submarine on her port side.
16.
Oxygen fraction of the loop gas is considerably less than of the supply gas in shallow water, and only slightly less at deeper depths, so the safe depth range for a given supply gas is smaller than for open circuit, and the variation in oxygen concentration is also disadvantageous for decompression.
