El Fraile Island is approximately 7,500 yards south of Caballo Island. 

At the right-most corner of the island is a 4.7 inch breach loading Spanish gun, facing the boca grande channel of Manila Bay.  Corregidor is at far right.

Between 1909 and 1919, El Fraile was cut down and covered by a concrete shell made to resemble a Battleship. It was in all respects, designed like a ship, 350 ft long and 144 ft wide. The top deck was 40 ft above the mean low water mark. The exterior walls were between 25 and 36 ft thick.

Scrappers, who have gone to the extent of demolishing the very columns which hold up the Fort's concrete deck, may yet be responsible for its collapse. Sinking, however, is out of the question.

For further images: refer  The Case Report