A tourist submersible that went missing on a visit to the wreck of the Titanic with five people on board has just 40 hours of air left, the US Coastguard says.

The search to locate the small, deep-diving vessel is ongoing after it lost contact while diving near the wreckage of the Titanic.

The research vessel Polar Prince lost contact with the crew of the Titan sub an hour and 45 minutes into its dive.

Tour firm OceanGate said it was exploring all options to get the crew back safely, and government agencies have joined the rescue operation.

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