Search for missing Titanic submersible_ - What we know so far

Titanic tourist submersible goes missing with search under way

A massive search and rescue operation is under way in the mid Atlantic after a tourist submarine went missing during a dive to Titanic's wreck on Sunday.

The submersible usually carries a pilot, three paying guests, and what the company calls a "content expert".

The trip sets sail from St John's in Newfoundland. Each full dive to the wreck, including the descent and ascent, reportedly takes around eight hours.

The OceanGate website lists three submersibles it owns, and only the Titan is capable of diving deep enough to reach the Titanic wreckage.

The vessel weighs 23,000 lbs (10,432 kg) and, according to the website, can reach depths of up to 13,100 ft and has 96 hours of life support available for a crew of five.