A former employee warned company executives about the inefficiency of their hull design and the company's testing methods.

The Titanic has intrigued the public from the moment it tragically crashed into an iceberg in the Atlantic Ocean and sank on April 15, 1912.

OceanGate said it is suspending all exploration and commercial operations after five people were killed during its expedition to the Titanic wreckage.

Debris from the submersible that catastrophically imploded while on a voyage to see the Titanic wreckage last week was brought ashore Wednesday morning.

While the recovery operation and investigation remains ongoing, here's what we know about the situation and how it unfolded.

Liability waivers "are not automatically enforceable," one expert said of a potential case against the submersible company.

The Navy used a Cold-War-era sonar system to detect and locate the sound's origin.

Titan victims' deaths ‘brought the world together,’ uncle says.

The company behind the missing Titanic tourist submersible exaggerated the details of the industry partnerships behind its titan submersible.

The Coast Guard policy is not to ask for a refund from private operators.

Here's what we know about the crew of the OceanGate sub.

James Cameron has compared the tragic loss of the submersible Titan to the very thing that may have led the Titanic to its own demise.

The five-person submersible suffered an implosion, a Coast Guard official said.

Despite their onboard oxygen tank expected to be depleted sometime Thursday morning, the five people aboard the lost Titanic tourist sub could survive for hours.

U.S. Coast Guard officials conceded crews are facing a daunting investigation to determine what caused the Titan submersible to implode underwater.

OcenaGat founder and CEO Stockton Rush is among the passengers on the missing vessel.

The submersible reported missing miles off the coast of Cape Cod was an unorthodox vessel with a relatively unproven history, according to company materials and experts.

Retired Navy Capt. David Marquet, a former submarine commander, spoke with ABC News about the risks to rescue the lost tour submersible.

Mike Reiss, who has done four, 10-hour dives with OceanGate, including one to the Titanic, told ABC News his sub lost contact with the host ship on every dive.

Venturing 13,000 feet under the sea to see the wreckage of the Titanic is a dangerous endeavor as a former ABC science editor knows all too well

A submersible has gone missing while on a tour of the wreckage of the Titanic off the coast of Newfoundland, Canada.

The vessel, made of carbon fiber, was reported overdue by OceanGate Inc. on Sunday, prompting a Coast Guard search effort for the massive submersible.