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The annual cuttlefish aggregation at Chesil Beach typically occurs from late April through June, peaking in May. Hundreds of common cuttlefish gather in the shallow waters off the beach for mating and egg-laying. Males perform competitive displays, changing colour and texture in dramatic confrontations. Females lay clusters of black eggs on seagrass and underwater structures. The event is one of the largest cuttlefish gatherings documented in UK waters and attracts underwater photographers from across Europe. The cuttlefish prefer calm conditions and are most active during early morning dives.

The shore entry at Chesil Beach requires reasonable fitness and preparation. The beach is composed of large pebbles that shift underfoot, making the walk to and from the water challenging in full dive equipment. The gradient is steep, meaning you enter waist-deep water within a few steps. Most divers kit up at the car park and walk approximately 50 metres across the shingle to the waterline. A surface swim of 50 to 100 metres reaches the reef and interesting terrain. Conditions are best with a southwesterly swell below one metre and on a rising tide.

Chesil Beach supports a rich temperate marine ecosystem year-round. Conger eels occupy crevices in the rocky reef, some exceeding two metres in length. Over thirty species of nudibranch have been recorded, making it a premier UK macro photography site. Spider crabs aggregate in shallow water during spring moults. Short-snouted seahorses are occasionally found in seagrass areas. Ballan and cuckoo wrasse are abundant on the reef, and bass patrol the edges. Lobsters and brown crabs occupy holes in the rock throughout the year.

Yes, a small pier diving fee is charged by the Swanage Pier Trust to help maintain the structure. The fee is currently a few pounds per diver and is payable at the pier entrance. The pier is privately owned and managed as a heritage structure, and diving income contributes to its preservation. There are changing facilities, a car park, and the pier itself provides convenient entry and exit points with ladders at several positions along its length.

The cuttlefish breeding season at Swanage Pier runs from approximately April through June, with peak activity in May. During this period, large numbers of common cuttlefish gather in the shallow water around and beneath the pier to mate and lay eggs. The males display dramatic colour changes during courtship, and females attach their black grape-shaped eggs to structures under the pier. This aggregation is one of the most reliable and accessible cuttlefish events in British waters and draws underwater photographers from across the country.