A renowned Titanic expert, a world-record holding adventurer, two members of one of Pakistan's wealthiest families and the CEO of the company leading an expedition to the world's most famous shipwreck are facing critical danger aboard a small submersible that went missing in the Atlantic Ocean. The submersible Titan was reported overdue Sunday night about 435 miles (700 kilometers) south of St. John’s, Newfoundland, according to Canada’s Joint Rescue Coordination Center, spurring a desperate international rescue effort. Rescuers were racing against the clock because the oxygen supply could run out by approximately 6 a.m. Thursday. MORE: https://www.wtsp.com/article/news/nation-world/titanic-sub-missing-passengers-hamish-harding-shahzada-dawood-paul-henry-nargeolet-suleman-dawood/507-48e529f8-a326-4029-a2a5-8c9cfbf92eb3 ►Subscribe: https://on.wtsp.com/youtube ►Website: https://www.wtsp.com/ ►Facebook: https://facebook.com/10TampaBay ►Twitter: https://twitter.com/10TampaBay