The Mandy Ray Wreck is a deep-water site in the Long Island Sound reaching depths of 34 metres. This advanced dive requires boat access and involves navigating moderate currents and cold water temperatures ranging from 5 to 17 degrees Celsius. Divers must manage entanglement risks within the wreck structure and remain vigilant of active boat traffic during ascent. A surface marker buoy is essential for safety when surfacing. Due to the depth and thermal conditions, appropriate drysuit or heavy wetsuit protection is required. Species recorded around this area include gurnard, pufferfish, barracuda, spotfin butterflyfish, horseshoe crab, wrasses, groupers, toadfish, sea bass, crab, lizardfish, righteye flounder, common sea star, and temperate bass.

Ponquogue Bridge is a shore-accessible drift dive site located in Hampton Bays. The site features an artificial reef structure beneath and around the bridge, with depths ranging from 0 to 10 metres and an average depth of 5 metres. Divers should be prepared for strong currents and variable visibility between 2 and 10 metres. Due to the nature of the location, hazards include boat traffic, potential entanglement, and surf. This site is suited for intermediate divers, with typical dives lasting around 35 minutes. Parking and toilets are available, though seasonal parking permits are required for access.

The Oregon is a deep wreck dive located in the Long Island Sound, resting at depths between 25 and 40 metres. This site requires boat access and is suited for intermediate divers with advanced or deep certifications. Divers encounter strong currents and visibility ranging from 10 to 30 metres. The wreck features an overhead environment, necessitating caution regarding entanglement. Water temperatures fluctuate between 6C and 18C, requiring appropriate thermal protection. The structure supports various reef fish and invertebrates that have colonised the site over time. Divers should plan for slack water to safely explore the deeper sections of the wreck, and a surface marker buoy is essential.

The Halftime is an artificial reef wreck located in the Long Island Sound, United States. Resting at depths between 18 and 25 metres, with an average depth of 21 metres, this site is strictly for advanced divers. Access is by boat only, situated 25 kilometres from shore. Divers must manage moderate currents during descent and ascent. The wreck structure presents a significant risk of entanglement, requiring careful navigation and appropriate safety gear. Water temperatures fluctuate between 5C and 18C throughout the year. Due to the nature of the site and potential for variable conditions, divers should maintain high situational awareness at all times.

Shinnecock Canal Jetty is an artificial reef located in the Long Island Sound, offering shallow depths between 2 and 4 metres. This site serves as a practical training area for beginner divers. Access is via the shore, though divers must exercise caution due to surf, surge, and a shore break during entry. Once submerged, the current is generally mild along the structure. Visibility typically ranges from 5 to 6 metres but remains variable. Due to heavy boat traffic in the area, the use of a surface marker buoy is essential throughout the 45-minute dive. On-site facilities include parking, toilets, showers, changing rooms, and a rinse station.

The USS San Diego is an artificial reef wreck located in the Long Island Sound. Resting at depths between 20 and 35 metres, this site is suited for advanced divers with wreck certification. Access is by boat only, situated approximately 21.7 kilometres from shore. Divers should be prepared for moderate currents and variable visibility ranging from 3 to 18 metres. Water temperatures fluctuate between 5°C and 18°C, necessitating a drysuit or a 7mm wetsuit with a hooded vest. Due to the depth and potential for nitrogen narcosis, careful bottom time management and redundant lighting are essential for navigating this challenging wreck.

Roanoke Point Ships is a shallow wreck site located in Long Island Sound, suitable for beginner divers. The wreckage lies at depths between 3 and 6 metres, approximately 50 metres from the shore. Divers can access the site via boat or a shore entry, though caution is required due to potential surf and shore break at the beach. Visibility ranges from 10 to 30 metres, though conditions can change rapidly. Water temperatures fluctuate significantly throughout the year, ranging from 4C to 22C, necessitating appropriate thermal protection. While the current is generally mild, it can increase, requiring divers to monitor local conditions closely before entering the water.

Duck Pond Point is a shallow reef site in Long Island Sound, offering a drift dive experience suitable for beginners. Located 200 metres from the shore, the site features depths between 3 and 5 metres with an average of 3 metres. Divers should be prepared for a surf break at the shore entry point and moderate currents throughout the dive. Visibility typically ranges from 3 to 5 metres. The habitat supports a variety of temperate reef fish and invertebrates. Parking is available on-site, and the average dive duration is 54 minutes. Always assess entry conditions carefully before crossing the shoreline.