Undersea explorers mark a tragic day. Things to know about the Titan disaster anniversary

abcnews.go.com:

Unanswered questions linger a year after the implosion of the Titan submersible during its deep-sea voyage to the wreckage of the Titanic

PORTLAND, Maine — A year after an experimental submersible imploded en route to the Titanic, unanswered questions linger — with no immediate answers.

Tuesday marks one year since the Titan vanished on its way to the historic wreckage site. After a five-day search that captured the world's attention, officials said the craft had been destroyed and all five people on board killed.

The U.S. Coast Guard quickly convened a high-level investigation into what happened. Concerns leading up to the investigation included the Titan's unconventional design and its creator’s decision to forgo standard independent checks.

A look at the one-year anniversary of the Titan tragedy:

Coast Guard officials said in a statement last week that they would not be ready to release the results of their investigation by the anniversary. A public hearing to discuss the findings won't happen for at least two more months, they said.

Investigators “are working closely with our domestic and international partners to ensure a comprehensive understanding of the incident," Marine Board of Investigation Chair Jason Neubauer said, describing the inquiry as a “complex and ongoing effort.”

The Titan was owned by a company called OceanGate, which suspended its operations last July, not long after the tragedy. OceanGate declined to comment.

The Titan made its last dive on June 18, 2023, a Sunday morning, and lost contact with its support vessel about two hours later. When it was reported overdue that afternoon, rescuers rushed ships, planes and other equipment to the area, about 435 miles (700 kilometers) south of St.