However little of it remains today, mainly due to the constriction of coastal artillery placements by the British since the 1920 in the Ostenburg ridge.

In 1920, the British began deploying coastal artillery on the Ostenburg ridge to protect the entrance to the Trincomalee harbor which had become a major Royal Navy base in the Far East.

Mounted on the ridge was a battery of three BL 6 inch Mk VII naval guns within casemates and with individual underground ammunition stores.

Fire control tower was constructed which commands a 360 degree view of the area and was used for directing artillery along with concrete quarters that were built for the gun crews.

Much of the museum itself is housed in ground level and underground casements built during World War II.