A tunnel-like passage built in with a drainage canal emptying out into the moat, its primary use was to transport ammunitions to Reducto de San Pedro. The site was known as "No.1 Victoria St." when it served as General  Douglas MacArthur's headquarters in 1941.

This is an independent pentagonal structure built outside the walls. A ramp on one side of the structure leads to the parapet on top. The structure was used as a powder magazine during Spanish times and as an office of the USAFFE during the pre-war period.

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