A yr after Titan's dive, deep-sea explorers vow to pursue ocean's mysteries

The deadly implosion of an experimental submersible en route to the deep-sea grave of the Titanic last June has not dulled the desire for further ocean exploration, despite lingering questions about the disaster.

Tuesday marks one year since the Titan vanished on its way to the historic wreckage site in the North Atlantic Ocean. After a five-day search that captured attention around the world, authorities said the vessel had been destroyed and all five people on board had died.

Concerns have been raised about whether the Titan was destined for disaster because of its unconventional design and its creator's refusal to submit to independent checks that are standard in the industry.

The US Coast Guard quickly convened a high-level investigation into what happened, but officials said the inquiry is taking longer than the initial 12-month time frame, and a planned public hearing to discuss their findings won't happen for at least another two months.

Meanwhile, deep-sea exploration ...