Greenport Jetty is an artificial reef located in the Long Island Sound, offering shallow depths between 3 and 5 metres. This site is suitable for beginners and snorkellers, with both shore and boat access available. Visibility typically ranges from 5 to 10 metres, and the area experiences mild currents. Water temperatures fluctuate significantly throughout the year, ranging from 4C to 22C, requiring appropriate thermal protection. Divers should maintain high vigilance for boat traffic near the entry point and deploy a surface marker buoy. Be aware of jellyfish, which may congregate in the shallows during warmer months.

Secret Beach in the Long Island Sound offers a shallow reef and kelp forest environment suitable for beginners. Divers and snorkellers can expect an average depth of 3 metres, with visibility ranging from 2 to 9 metres. Entry is via the shore, and the site is accessible for both diving and snorkelling activities. Due to the nature of the location, divers should remain aware of boat traffic in the area. Water temperatures fluctuate significantly throughout the year, ranging from 4C in February to 22C in July and August. The habitat supports a variety of temperate marine life typical of the region, including various reef fish and invertebrates.

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.

Rocky Point in the Long Island Sound features a combination of natural and artificial reef structures. Divers can explore this site at depths ranging from 5 to 18 metres. Access is available via both shore and boat entries. Conditions include mild currents, though divers should be prepared for surge and swell upon entry. Visibility typically ranges between 5 and 15 metres but can shift rapidly during a dive. Water temperatures fluctuate significantly throughout the year, ranging from 4C to 18C, necessitating appropriate thermal protection for the season. The site is suited for intermediate divers, with typical dive times around 40 minutes.

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.

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.

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.