The F1 engine was developed by Rocketdyne in the late 1950s. A cluster of five F1 engines on the Saturn V launch vehicle’s first stage boosted the Apollo spacecraft to about a 36-mile altitude, after which it was jettisoned and stage two engines boosted the craft into the upper atmosphere. The F1 used hypergolic propellants (kerosene and liquid oxygen) to produce 1.5 million pounds of thrust. In 2013, an expedition funded by Amazon CEO Jeff Bezos located and raised an F1 engine from the ocean floor. After some restoration work, they determined that they found the center engine to the Saturn V used for the the Apollo 11 mission.