OceanGate

The lead engineer for an experimental submersible that imploded en route to the wreck of the Titanic says he felt pressured to get the vessel ready to dive and refused to pilot it.

No one survived the trip aboard the experimental submersible owned by OceanGate, a company in Washington state that has since suspended operations. The lawsuit was filed Tuesday.

As other entrepreneurs have pushed the edge of technology to bring well-heeled tourists to space, Stockton Rush saw new opportunities for exploring another frontier: the deep sea. He founded Everett, Wash.-based OceanGate in 2009.

A commercial submarine operator is teaming up with the University of Washington to build a new manned deep-sea sub. The five-passenger mini-sub could be…