A pioneer of the ocean's depths, his spirit of innovation sails on in the vast, unexplored seas.
Rush, a British businessman, founded OceanGate in 2009 and served as the organization's CEO, overseeing the development of submersibles that would be able to travel up to 20,000 feet below the ocean's surface.
In 1981, Rush became the youngest jet transport rated pilot in the world at the time at 19, flying to destinations, such as Cairo, Mumbai and Zurich, according to his biography.
He received a bachelor's degree in aerospace engineering from Princeton University and a business master's degree from UC Berkeley. In 1989, he developed his own experimental aircraft, which he had flown before.
He additionally served on boards and development teams for companies making sonar systems, software and remote controls, as well as at The Museum of Flight in Seattle.
He has tragically died in "Titan" catastrophical implode accident.