In Season 10, Episode 7, “Heavy-lift Helicopter,” the S-64 is described as a historic machine unlike any other on planet earth.

Originally designed in the 1960s, this game-changing flying machine was built with a simple goal: to transport more weight by helicopter than ever before. Created by Igor Sikorsky, it was first used in the Vietnam war, offering unparallel transport and aircraft recovery capabilities. The S-64 was incomparable to any other helicopter of the time.
“Doing what I do in the heavy-lift industry, I’d say that this is the best tool that there is.”
Doug Szyperski