Everyone knows that billionaire Elon Musk has a thing for space exploration and that his company SpaceX, is one of the premiere commercial space exploration outfits out there.
But few people know that Amazon founder Jeff Bezos, one of the richest people in the world, also has a passion for space.
In fact, he's been using part of his fortune to recover a valuable piece of space history, the F1 engines that carried the Apollo 11 mission, the mission that would put the first man on the Moon.
The engines were discarded during launch and have been resting on the Pacific ocean floor for the past 40 years.
He set up Bezos Expeditions to recover at least one of them and last year he announced that he had discovered their location using advanced sonars.
Now, the mission is returning from sea with two F1 on board and many photos and videos of what it discovered 4,000 meters (14,000 feet) below the surface.