Flown Apollo F-1 Injector Plate from the Saturn V

It hit the ocean at 5000 MPH and sank deeper than Titanic, but Bezos found it using robotic subs, and it just went on display at the Seattle Museum of Flight.

The F-1 pumps push fuel in through these spray nozzles (overpowering the combustion pressure pushing back the other direction) with the force of 30 diesel locomotives. In addition to fuel, the engine pumped 413 gallons of liquid oxygen per second through this to the combustion chamber, at -183°C.