The Coast Guard has recovered remaining debris, including presumed human remains, from a submersible that imploded on its way to explore the wreck of the Titanic, killing all five onboard, deep beneath the Atlantic Ocean’s surface, officials said Tuesday.

The Coast Guard said that the recovery and transfer of remaining parts was completed last Wednesday, and a photo showed the intact aft titanium endcap of the 22-foot (6.7-meter) vessel. Additional presumed human remains were carefully recovered from within Titan’s debris and transported for analysis by U.S. medical professionals, the Coast Guard said.

The salvage mission conducted under an agreement with the U.S. Navy was a follow-up to initial recovery operations on the ocean floor roughly 1,600 feet (488 meters) away from the Titanic, the Coast Guard said.