The issue was that OceanGate did not go through the industry's recognized certification process for the sub's design, fabrication and testing.
Five passengers were on the missing submersible that can keep them alive underwater for a maximum of 96 hours.
A five-person submersible vessel taking tourists on a $250,000 trip to see the wreckage of the 1912 Titanic disaster 12,500 feet (3,800m) undersea is missing in the Atlantic off Canada.
A submersible vessel taking tourists on a deep ocean journey to view the wreckage of the Titanic has been missing since Sunday. One pilot and four passengers are aboard.
US and Canadian ships and planes began swarming the area on Monday about 900 miles (1,450 km) east of Cape Cod, some dropping sonar buoys that can monitor to a depth of 13,000 feet.
The "HMS Triumph" was used for missions that included landing agents from the British Special Operations Executive and MI9 organizations.
The Iranian Karrar drone has been seen with what looks like a Mark 46 torpedo in previous imagery seen back in April.
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