The family of Hamish Harding, one of the passengers who perished on the Titan submersible, criticized his alma mater for throwing an underwater themed ball with submarine decorations.
Debris from the Titan submersible indicates that a catastrophic implosion destroyed the sub and instantly killed the five passengers onboard.
The tragedy of the Titan submersible that imploded during its expedition was an outlier, given that the maker of the vessel opted against certifying the vessel, defying industry convention.
According to reports, the other submersible, called Limiting Factor, is owned by video game developer Valve Software CEO Gabe Newell.
Rush, who is married to Wendy Rush, is chief executive of US-based OceanGate Expeditions which operates the Titan submersible.
OceanGate believes that the passengers on the Titan submersible have "sadly been lost" in a statement cited by CNN.
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.
It is not yet known how many people are missing aboard the sub, but one British billionaire was confirmed to have been on board.
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