U.S. Coast Guard officials say they have launched a formal investigation into the sinking of a commercial fishing vessel off Gloucester, Massachusetts, that resulted in seven deaths.

The operator of an experimental submersible that imploded while seeking out the sunken Titanic was either putting profits over safety or pushing humankind’s boundaries.

Rescuers have rushed more ships and vessels to the area where a submersible disappeared on its way to the Titanic wreckage site.

In a race against the clock on the high seas, an expanding international armada of ships and airplanes is searching for a submersible that vanished in the North Atlantic while taking five people down to the wreck of the Titanic.