Brant Rock in Cape Ann provides shore-access diving along a reef and wall structure situated at depths of 9 to 12 metres. The site features a drift element where moderate currents move divers along the reef face. Visibility typically ranges from 5 to 10 metres. Due to the surf and shore break, entry requires caution, and divers should be aware of potential rip currents. Water temperatures fluctuate between 4 and 18 degrees Celsius, necessitating thick exposure suits, hoods, gloves, and boots. Facilities including parking and toilets are available on site to assist with gearing up and warming down.

The Unidentified Trawler is a shipwreck located on Stellwagen Bank near Cape Ann, United States. Resting at depths of 32 to 33 metres, this site functions as an artificial reef on an otherwise featureless bottom. Divers encounter strong currents and visibility ranging from 5 to 12 metres. Due to the significant depth, cold water temperatures between 4 and 16 degrees Celsius, and entanglement risks within the structure, this site is suitable only for advanced divers. Boat access is required, and surface markers are essential due to active boat traffic. Dry suits are recommended for thermal protection, and dives should be planned around slack water to manage current intensity.

The Josephine Marie is a deep wreck located 9656 metres off the coast of Cape Ann. Resting at a constant depth of 32 metres, this site is strictly for advanced divers. Conditions are challenging, featuring strong currents and visibility ranging from 9 to 12 metres. Water temperatures remain cold, rarely exceeding 10 degrees Celsius at depth, necessitating the use of a drysuit. Divers must manage significant entanglement risks within the wreck structure and remain vigilant regarding heavy local boat traffic. A surface marker buoy is essential for safety, and descents should be timed to coincide with slack water to mitigate the impact of the currents.

Sponge Forest is a deep-water reef located off Cape Ann, requiring boat access. The site sits at depths between 20 and 33 metres, with an average depth of 32 metres. Divers encounter strong currents and visibility reaching 30 metres. Water temperatures are cold, ranging from 5 to 16 degrees Celsius, with temperatures at depth rarely exceeding 10 degrees Celsius. Due to the depth, cold conditions, and potential for strong currents, this site is suitable only for advanced divers. Hazards include boat traffic, entanglement risks, jellyfish, and sharks. Divers should use a drysuit and maintain strict buoyancy control while monitoring depth and current conditions closely.

Boston Harbor in Cape Ann offers a varied underwater environment featuring reefs, wrecks, and artificial reefs suitable for intermediate divers. The site requires boat access and is subject to moderate currents and variable visibility ranging from 5 to 25 metres. Depths at this location extend from 10 to 70 metres, with an average depth of 45 metres. Due to cold water temperatures between 4C and 12C, a dry suit is required in winter, while a 7mm wetsuit with a hood is recommended during summer months. Divers should remain vigilant regarding boat traffic, entanglement risks, and potential surf conditions.

Halfway Rock is a boat-access site located 1609 metres off Cape Ann, featuring a diverse topography of reef, wall, and pinnacle structures. The site ranges in depth from 15 to 30 metres, with visibility typically between 5 and 15 metres. Divers must be prepared for moderate currents, surge, and cold water temperatures ranging from 4 to 15 degrees Celsius. A thermocline is present, with temperatures below 15 metres often remaining near 10 degrees Celsius. Due to the depth and conditions, this site is suited for intermediate divers. A dry suit or thick wetsuit with hood and gloves is essential year-round to manage heat loss.

Nahant Beach in Cape Ann offers a diverse underwater topography featuring reefs, canyons, caverns, and pinnacles. This shore-entry site is suitable for beginners, with depths ranging from 3 to 14 metres and an average depth of 8 metres. Divers should be prepared for cold water temperatures between 4 and 16C, alongside moderate currents and variable visibility of 6 to 9 metres. Hazards include surf, surge, rip currents, and potential entanglement. The site provides parking and toilet facilities for visitors. Typical dives here last approximately 50 minutes. Due to the presence of caverns and overhead environments, divers should maintain appropriate training and awareness of their surroundings.

Saturday Night Ledge is a complex marine site located 4828 metres off the coast of Cape Ann. This advanced dive site features a combination of reef, wall, and canyon topography. Divers can expect depths ranging from 18 to 44 metres, with an average depth of 30 metres. Access is strictly by boat. Conditions are challenging, characterised by strong currents and visibility typically between 5 and 15 metres. Water temperatures are cold, fluctuating between 4C and 13C throughout the year. Due to the depth, current, and potential for low visibility, this site is suitable only for experienced divers. Hazards include boat traffic, entanglement risks, and cold water exposure.