Brick structure and bunker of the No.1 sea fort
Most of the No. 1 sea fort way of brickwork were piled British way
, but the bricks in the central convex part were stretcher bond, and the cylindrical brickwork in the basement of the first lighting station were header bond.
The bunker below the first battery has a brick structure in both the arch and leg walls, and is believed to have been built by the Sino-Japanese War.