A year after Titan sub implosion, an Ohio billionaire says he wants to make his own voyage to Titanic wreckage

Five people boarded OceanGate's Titan submersible last summer to dive down to see the wreckage of the Titanic, but less than two hours later, the vessel imploded, killing all on board. Now, a billionaire from Ohio wants to make his own attempt – an idea he had just days after the Titan met its fatal end.

Patrick Lahey, co-founder and president of Tritan Submarines, is no stranger to deep-dive expeditions. He was the second Canadian to visit the bottom of the Mariana Trench nearly 36,000 feet under the ocean's surface. He told the Wall Street Journal that he'd spent years working to make submersibles safe for deep dives, making sure his company's vessels were certifiably safe. Then when last year's implosion happened – killing the vessel's overseer and captain – there were concerns that nobody would trust such expeditions again. 

But a few days after the incident, Lahey told The Wall Street Journal that he got a call from a client who seemed determined to build a safe, reliable submersible.