Midnight parrotfish are not a common sight on most reefs, however, but we see many on this site. These big fish are midnight blue with lighter bright markings on the head above the mouth. Stoplight and princess parrotfish are also common around London Bridge. Smaller reef fish, such as bi-colour damselfish and chromis, create soft clouds across the hard rocky surface. The current carries us around a corner and we look up at the rugged structures above us.
Angular rocks shoulder away the waves as they rush at the cliff face.
We swim around the western arm of the bridge and now pass across the entrance of the hole. A large rock ahead of us has attracted a big school of boga. They swim in a polarised school, their silvery blue bodies forming a streak of sparkling light, an underwater fireworks display. A few black jacks are hanging out near the entrance and we find a spotted moray protruding from its hole, mouth agape as if pulsating in time with the surge. Over the rock, another wall awaits our inspection.