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Another view of the forward end of the S-3D rocket engine.

Picture 2 of 2.

At center of this photo is the turbopump's turbine (the greenish disc).

Forward of that, coming through the aft bulkhead of the LOX tank, is what would appear to be the fuel feed duct.

To the right of the turbine is the turbine exhaust duct, with its elbow and bellows, leading into the heat exchanger (mostly out-of-focus at lower right).