Onboard the missing Titanic submarine are five passengers, namely, British billionaire Hamish Harding, OceanGate CEO Stockton Rush, French diver Paul-Henri Nargeolet, one of Pakistan's richest men Shahzada Dawood and his son Suleman. Rescue operations are currently underway to find the submersible, which lost contact about an hour and 45 minutes into its dive in the Atlantic Ocean on Sunday.