Set on a limestone outcrop on the south side of the bay, the fortification occupies a natural niche in the formation, with a wall of piled coral rocks and cement covering part of the opening.

A cement gunport is set in the wall, about 0.75 metres (2.5 ft) above ground level.

[2] The structure was listed on the National Register of Historic Places in 1991, as "Inalahan Pillbox".

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