The U.S. Coast Guard has announced that officials believe the five people aboard a submersible vessel that had gone missing near the Titanic wreckage are dead.

The 22-foot vessel operated by private company OceanGate left on a tourist expedition Sunday to get close to the deep-sea wreckage, carrying a pilot and four passengers who had paid up to $250,000 each for the trip. The submersible, named Titan, lost contact en route to the wreckage, leading to a massive search to find the vessel in the North Atlantic before its crew ran out of oxygen.

On Thursday, the U.S. Coast Guard and OceanGate said that they believe every person in the submersible is dead. Remotely-operated vehicles discovered a debris field near the Titanic wreckage that officials say is likely the remains of the Titan sub. The Coast Guard said it believes the vessel imploded on its way down to the site, killing all five men aboard.

These men were true explorers who shared a distinct spirit of adventure, and a deep passion for exploring and protecting the worlds oceans, OceanGate said in a statement Thursday . Our hearts are with these five souls and every member of their families during this tragic time.

The victims were Stockton Rush, Hamish Harding, Paul-Henri Nargeolet, Shahzada Dawood and Suleman Dawood. Here is what we know about them:

Stockton Rush, 61