A look back at search operations for the Titan sub

A recap of search operations for the Titan sub as experts have recovered presumed human remains from what is left of the sub that imploded during a dive to the Titanic wreck, with the death of five people according to the US Coast Guard.

On board were British explorer, French submarine expert, Pakistani-British tycoon and his son and CEO of the sub's operator Ocean Gate Expeditions. They presumably died instantly when the Titan sub, about the size of an SUV car, imploded under the crushing pressure of the North Atlantic at a depth of more than two miles.

Mangled debris recovered from the small submersible was offloaded earlier in the day in eastern Canada, bringing to an end a difficult search-and-recovery operation. That debris will now be taken aboard a US Coast Guard cutter to a US port for further analysis, the organization said.

Titan was reported missing on June 18. A debris field was found on the seafloor, 1,600 feet from the bow of the Titanic, which sits more than two miles below the ocean's surface and 400 miles off the coast of Newfoundland. The Coast Guard has launched its highest level of probe, called a Marine Board of Investigation, into this accident.