A massive search effort continues in the Atlantic Ocean after a tourist submersible went missing during a trip to explore the wreck of the Titanic, which sits over 12,000 feet below sea level. Five passengers are on board, including the founder of OceanGate Expeditions, which organized the trip. For years the company ignored warnings by its own staff and experts that the company’s deep water missions could lead to a catastrophe because the submarine did not meet industry standards. Tickets for the mission reportedly cost $250,000. Passengers aboard the ship include two billionaires: Hamish Harding from Britain and Shahzada Dawood from Pakistan, who is on board with his son.