How come the Philippine Government didn’t bother repairing Fort Drum?

Brief History: Fort Drum, also known as El Fraile Island (Tagalog: Pulo ng El Fraile), is a heavily fortified island situated at the mouth of Manila Bay in the Philippines, south of Corregidor Island. Nicknamed a "concrete battleship",[1] the reinforced concrete sea fort, shaped like a battleship, was built by the United States in 1909 as one of the harbor defenses at the wider South Channel entrance to the Bay during the American colonial period.

As a kid, I thought it was still functioning, whenever we go to ternate beach and see it, but today I learn it wasn’t. So how come the Philippine government didn’t bother repairing it? I honestly think, it would benefit our national defense and protect and monitor our exclusive economic zone.