This Soviet diver training tank sits inside a narrow, decaying three-storey building in Latvia.

A tight spiral stair wraps around a tall concrete tank with portholes for monitoring trainees. At the top, the open tank drops three storeys and still holds water, with a radiator fixed to prevent freezing.

Abandoned suits, masks and other equipment remain. Documents reference the SVU-3 diving system from the 1970s.

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