This is a spectacular dive in good visibility, and large numbers of fish may be seen. Outer Castle is structurally part of the same reef, but has historically been considered a separate site. The site was known by the name “Pie Rock” before 2004. The sections were named after mapping started
- S34°14.375′ E018°29.075′ 1 North Pie Rock
- S34°14.400′ E018°28.900′ 1 West Pie Rock Reef
- S34°14.445′ E018°28.985′ 1 South Pie Rock Reef pinnacles
North Pie Rock pinnacles are about 760 m from the north entry area at Castle Rocks. Bearing 353° True (017° magnetic) to Bakoven Rock, approximately 278° True (302° magnetic) to north side of Castle Rocks, and about 150 m south east of Outer Castle, There is an iron anchor to the east of the main pinnacles at about 18 m depth at S34°14.381′ E018°29.105′
South Pie Rock Pinnacles are in the extreme southern part of these reefs, nearly directly south of the North Pie Rock area, on a distinct lobe delineated by sand tongues to the east and west, and sandy bottom to the south. The western reef is inshore of the south pinnacles, and there is an unexplored lobe of reef to the east, which will probably end up being called East Pie Rock Reef. There are other nearby reefs across sandy gaps of varying widths. Some have been explored, others may never have been dived.
This site is in a Marine Protected Area (2004). A permit is required. The site is entirely inside the Castle Rocks Restricted Zone.