Rescuers are racing to find the Titan, a deep-sea vessel that went missing on June 20 as it carried five people to see the remains of the Titanic, but time is growing short.

The trip to the bottom of the ocean to see the worlds most famous shipwreck might be the adventure of a lifetimeeven for the serial adventurer along for the ride, U.K. billionaire Hamish Hardingbut questions are being raised about the craft that takes people to it. The Titan has never had an incident nearly as serious as the current one, but past reports about it show a history of rough waters.

The BBC, for example, quotes passengers from a 2022 dive, talking about problems with the Titans thrusters when they reached the ocean floor.

Oh no. We have a problem, submersible pilot Scott Griffith reportedly said.

One of the vehicles thrusters was thrusting backward instead of forward, which temporarily meant the craft could only rotate in a circle. The issue was resolved by holding the controller that steers the vessela modified Logitech F710 video game controllerin the opposite direction.

A CBS correspondent who made the journey last year saw one attempt scrubbed when a float came off the launch platform. And when the dive actually took place, communications between the sub and the surface ship broke down, resulting in the sub never finding the Titanic. (The ship is supposed to guide the sub to the shipwreck via text messages.)

We were lost, said passenger Shrenik Baldota. We were lost for two and a half hours.

David Pogue, the CBS reporter who went along on the journey, described the submersible as having some elements of MacGyver jerry-riggedness. I mean, youre putting construction pipes as ballast.

OceanGate Expeditions CEO Stockton Rush pushed back on that description, saying there are certain things that you want to be buttoned down. The pressure vessel is not MacGyver at all, because thats where we worked with Boeing and NASA and the University of Washington. Everything else can fail, your thrusters can go, your lights can go. Youre still going to be safe.

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