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Detail of the forward end of the combustion chamber.

Injector no. 1 appears at left.

Referring to the diagram on my info page, the hole toward the right (above the dome in the center of the combustion chamber) is injector no. 2.

It's harder to tell from the diagram, but it appears that the rectangular valve and associated tubing passing through the combustion chamber at lower right is the hydrogen line; the LH₂ inlet is opposite side of the helium heater; the LH₂ passes through regenerative coils (presumably the larger-diameter coils) in the interior of the combustion chamber to be heated prior to injection.