This is the prominent rock approx 100m north of the harbour. The ease of access and location make this site ideal for trainees, but care must be taken when diving the seaward side of the site, which is very close to the fairway. A short snorkel to the rock face is advised as the area is very shallow and dries out at low tide, making entry and exits difficult.

Follow a kelp gully down the rock face to a large area of sand where flatfish, hermit crabs and large shoals of fish congregate. On the north side of the rock there is an overhanging gully that runs into a small cave, where the bell-shaped walls are festooned with dead men's fingers.

It can be very dark in this area, so a good torch is essential.

To the north-east of the harbour breakwater is a large rock approx 50m from the entry point which has become famous for the resident wolf-fish that lives on the western side. On the seaward side is a large bowl shaped feature known as the Amphitheatre. Best dived in the morning when the sunlight reflects off the sandy bottom. The site is home to several curious and friendly ballan wrasse, who will feed from your hand.

This is probably one of the least dived sites in the St Abbs harbour area, but is one of the most rewarding. The steep sided walls of the rock are alive with large multi-coloured dahlia anemones and dead men's fingers. It is a good site to see octopus or, in the latter part of the year, angler fish on the sandy bottom on the western side of the rock. Beware of the strong tides that sweep around this area.

This is the most famous dive site in the marine reserve and is the one which most people miss or can't find. The rock is easy to recognize by its twin archways of natural rock, one on top of the other. Air pockets trapped in the top arch can sometimes enable you to 'surface' underwater. The undersides of the arches are festooned with orange and white plumose anemones, Devonshire cup corals and various other colourful sponges. Due to the strong tides running through the site it is best dived at slack water.

Usually referred to as the "Peanut Boat" due to its principal cargo, the Odense can be dived from a boat or alternatively, it is a relatively easy snorkel from Petticowick. The Odense originally settled in very shallow water under the cliffs and the tops of the boilers can be seen from a boat at low tide. This is very much in the kelp zone so be prepared for a kelp crawl if you fancy your chances of finding anything here! Although it has been dived exhaustively, there is always the chance of turning something up, particularly straight after the winter.