Stonington Point is a shore-entry dive site featuring a combination of natural reef and artificial reef structures. The site is suitable for beginners, with an average depth of 5 metres and a total range of 2 to 6 metres. Divers should be aware of moderate currents, surf, and potential hazards including boat traffic, entanglement, and sharp coral. Visibility at the site typically ranges between 2 and 9 metres. Water temperatures fluctuate significantly throughout the year, ranging from 5C in February to 21C in August. Night diving is permitted at this location, with typical dives lasting approximately 45 minutes. The habitat supports a variety of temperate marine life and invertebrates.

New London Ledge Lighthouse functions as an artificial reef located in the Long Island Sound. The site features a submerged foundation at depths ranging from 1 to 9 metres. Divers can expect visibility between 5 and 10 metres. Access is strictly by boat, and the site is suitable for beginners. Water temperatures fluctuate significantly, ranging from 5C in winter to 22C in summer, necessitating appropriate thermal protection. Moderate to strong currents are common, so divers should remain close to the structure. Guided tours are available and recommended to navigate the foundation safely and manage current conditions effectively.

Ocean Beach is a shore-entry snorkel site located in the Long Island Sound. The site features a reef area accessible directly from the beach. Water temperatures fluctuate significantly throughout the year, ranging from 5C in the winter months to 22C during the summer. Snorkellers should be aware of the physical hazards present at this location, including a surf and shore break at the entry point. Strong currents and rip currents are also common, requiring careful monitoring of local conditions before entering the water. Facilities available on site include parking, toilets, and a cafe for post-snorkel refreshments.

Bigelow Hollow State Park offers freshwater diving within the Nipmuck Forest. Divers access the water via a shore entry, which requires a walk through the woods from the parking area. The site features depths ranging from 1 to 12 metres with visibility reaching up to 9 metres. Conditions include mild currents and a significant thermocline, with summer surface temperatures near 21°C dropping to approximately 4.4°C at depth. The site is suitable for intermediate divers, though caution is required due to boat traffic. Divers are advised to use a dive flag and may find a rolling cart useful for transporting gear to the water.

Larchmont is a shallow wreck dive located in the United States, resting at depths between 5 and 6 metres. This site is defined by its challenging conditions, including strong currents and visibility that can be limited to 5 metres. Due to the active current and potential entanglement risks posed by the wreck structure, this site is suited for intermediate divers comfortable managing difficult environments. Access is strictly by boat, and divers must remain vigilant regarding heavy surface vessel traffic. Divers should consult current tables before planning a dive and must deploy a surface marker buoy prior to ascent to ensure safety in this high-traffic area.

The Mount Hope Tug Boat is a shallow wreck and artificial reef located off Cape Ann. Resting at depths between 3 and 7 metres, this site is suitable for beginner divers. The wreck structure provides a habitat for various marine life, and visibility typically ranges from 5 to 15 metres. Divers should be aware of potential surge and swell, which can affect visibility, and remain cautious of boat traffic at the surface. Water temperatures fluctuate significantly throughout the year, ranging from 5 to 20 degrees Celsius. Species recorded around this area include wrasses, sea bass, common sea stars, crabs, cornetfish, snails, sea squirts, European green crabs, and star coral.

Horsehead is a marine site featuring a combination of reef and cave topography. Divers can explore depths ranging from 8 to 18 metres, with an average depth of 13 metres. The site is located 300 metres from shore and requires boat access. Conditions typically include mild currents and visibility between 5 and 10 metres. While the reef is accessible to beginners, the cave sections present an overhead environment. Divers without specific overhead training should remain within the natural light range of the exit and carry a dive torch. Due to potential surges and currents, check local conditions before planning your dive.