History Channel crew finds piece of space shuttle Challenger off Florida coast -...

In a preview posted to Twitter, two divers explore a large panel covered in orange tiles, partially covered by sand on the seafloor.

“Definitely an aircraft, I think we need to talk to NASA,” one of the divers says.

Agency officials viewed the footage and confirmed that the piece belonged to Challenger, NASA said in a news release Thursday. The agency did not say when the film crew discovered the fragment, which was submerged off Florida’s eastern coast near Cape Canaveral and remains on the seafloor.

By law, remnants of the space shuttles belong to the federal government, and NASA is considering what to do with the newly discovered piece “that will properly honor the legacy of Challenger’s fallen astronauts and the families who loved them,” it said.

Seven astronauts died when the spacecraft broke up 73 seconds after takeoff on Jan. 28, 1986.

An investigation later revealed that cold temperatures the morning of launch compromised the seal of O-rings in one of the rocket boosters. Several employees had raised concerns after seeing ice on the launch tower, but managers overruled them and cleared the Challenger to launch.

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The newly discovered piece is one of the largest discovered since the explosion and the first since 1996, NASA program manager Michael Ciannilli told the Associated Press.

“My heart skipped a beat, I must say, and it brought me right back to 1986 … and what we all went through as a nation,” Ciannilli, who oversees the agency’s Apollo, Challenger, Columbia Lessons Learned Program, told the Associated Press.

NASA estimates that it has recovered just under half the debris of Challenger, roughly 118 tons. Most of that sits in closed silos at Cape Canaveral Space Force Station, according to the AP. Several fragments are on permanent display in an exhibit at Kennedy Space Center.

NASA Administrator Bill Nelson said in a news release Thursday that the Challenger accident “still feels like yesterday” and will be always be a reminder for the agency to put safety first.

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“This discovery gives us an opportunity to pause once again, to uplift the legacies of the seven pioneers we lost, and to reflect on how this tragedy changed us,” Nelson said. “At NASA, the core value of safety is — and must forever remain — our top priority, especially as our missions explore more of the cosmos than ever before.”