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.

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.

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.

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.

12 Mile Reef is an advanced dive site located in the open waters of the Long Island Sound. This site features a combination of wreck structures and artificial reef materials that reach depths of up to 38 metres. Due to the depth and variable currents, this location is suitable only for advanced divers. Water temperatures range from 5C to 17C, necessitating the use of a drysuit or thick wetsuit. Divers should be aware of significant boat traffic in the area and must deploy a surface marker buoy during ascent. Visibility is highly variable, and carrying a torch is recommended for exploring the structure.

Sag Harbor Jetties is an artificial reef located 350 metres from shore in the Long Island Sound. The site features depths ranging from 3 to 12 metres, with an average depth of 3 metres, making it suitable for beginner divers. Divers can expect mild currents and visibility between 5 and 10 metres. The jetty structure provides habitat for various reef fish and invertebrates typical of the region. Due to active boat traffic in the area, divers must remain vigilant near the surface and are advised to tow a surface marker buoy. Water temperatures fluctuate significantly throughout the year, requiring appropriate thermal protection.

Horton Pt is a shallow reef and artificial reef site located in the Long Island Sound. Divers can explore depths between 3 and 5 metres, making it suitable for intermediate divers who possess solid buoyancy and navigation skills. The site is accessed via a shore entry, which requires caution due to surf and potential shore break. Conditions include moderate currents and visibility ranging from 1 to 5 metres. Water temperatures fluctuate significantly throughout the year, from 4C in winter to 22C in summer. Divers should be aware of entanglement risks around the artificial structure and the presence of sharp rocks and coral near the surface. Parking is available at the site.