Missing Titanic submersible search continues as banging sounds heard

Banging sounds have been heard during the search for the missing Titan submersible indicating "continued hope of survivors," according to an internal US government memo.

A massive search operation is underway to find the vessel with five people on board that went missing Monday on a trip to view the wreckage of the Titanic.

It's a race against time as the US Coast Guard says the vessel had "about 40 hours of breathable air left" during an update at 5 this morning.

Aboard are a British adventurer, a French diver, a Pakistani father and son and the founder of the company that operates the tour, according to social media posts, a family statement and sources.

[Source: CNN]