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EYOS Expeditions expedition leader Rob McCallum said, “It was amazing to set up a conversation between two 'spacecraft'; one operating as a platform for research in outer space, the other an exploration vehicle for ‘inner space’. Two groups of humans using cutting edge technology to explore the outer edges of our world. It highlighted the vast span of human endeavour while at the same time linking us close together as fellow explorers.”

Much like the recent launch of SpaceX’s Crew Dragon, the deep-diving submersible, \"Limiting Factor,\" is a privately funded exploration vehicle and comes with excitement about the potential of private companies contributing to the technological advancement of space flight, said the statement.

Sullivan, a veteran of three space shuttle flights, said it was “a once in a lifetime day.”

“As a hybrid oceanographer and astronaut this was an extraordinary day, a once in a lifetime day, seeing the moonscape of the Challenger Deep and then comparing notes with my colleagues on the ISS about our remarkable reusable inner-space outer-spacecraft,” wrote Sullivan in the statement.

Sullivan is only the eighth person to reach the bottom of the Challenger Deep, including “Titanic” director James Cameron.

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