Long Island

The USS San Diego is one of the most popular dive sites in Long Island, United States. This massive World War I armored cruiser wreck lies upside down at about 110 feet (33 meters). Its popularity stems from its historical significance, impressive size, and the abundant marine life it attracts, including lobsters and large schools of fish. As a protected war grave, it offers a solemn and awe-inspiring dive for experienced wreck divers.

Well-known sites in Long Island, United States, include the historic German U-boat U-853 and the passenger liner Oregon. For a fantastic, less-trafficked experience, divers might explore smaller wrecks like the 'Lizzie D' or the 'Heroine.' For an accessible shore dive, the old Ponquogue Bridge in Hampton Bays is a hidden gem, offering calm conditions and a surprising amount of macro life, perfect for training and less experienced divers.

Water temperatures when diving in Long Island, United States, vary significantly. In winter (Dec-Mar), temperatures can drop to 35-40°F (2-4°C). During the main dive season from June to October, temperatures warm up. Expect temperatures ranging from the high 50s°F (around 14°C) in early summer to a peak of 70-72°F (21-22°C) on the surface in late August and September, with colder temperatures at depth.

The best time to dive in Long Island, United States, is from late July to early October. During this period, the water reaches its warmest temperatures, and underwater visibility is typically at its peak. The weather is generally calm, providing the most favorable surface conditions for boat trips to the offshore wreck sites. While diving is possible earlier in the summer, conditions are most comfortable and reliable during these late summer and early autumn months.

Visibility while diving in Long Island, United States, is highly variable and depends on weather, tides, and time of year. During the prime season (late summer), you can experience excellent visibility of 50-80 feet (15-24 meters) on offshore wrecks. However, it can also drop to 10-20 feet (3-6 meters) after storms or during plankton blooms. Nearshore sites generally have lower visibility. Divers should always be prepared for changing conditions.

While Long Island, United States, isn't known for large migrations like whale sharks, there are distinct seasonal marine events. In summer and fall, massive schools of baitfish attract predators like striped bass and bluefish to the wrecks. Divers may spot migratory sand tiger sharks on deeper wrecks in late summer. Surface intervals often include sightings of dolphins and, occasionally, humpback whales further offshore.

Divers in Long Island, United States, can expect classic North Atlantic marine life. Wrecks are covered in colorful anemones, mussels, and hydroids. Common sights include large black sea bass, tautog (blackfish), cunner, and lingcod. Lobsters are abundant in the crevices of every wreck. You may also encounter dogfish sharks, skates, flounder, and large schools of baitfish. In late summer, look for triggerfish and even sea turtles that have ridden the Gulf Stream north.

For diving in Long Island, United States, a drysuit is highly recommended year-round for maximum comfort and safety. If diving with a wetsuit during the peak season (Aug-Sep), a 7mm full suit with a hood, gloves, and boots is the absolute minimum. For dives in the early or late season, a semi-dry suit or layering a 7mm with a 5mm shorty is a common choice for those without a drysuit.

To get to Long Island, United States, fly into one of New York City's major airports: John F. Kennedy (JFK), LaGuardia (LGA), or Long Island's own MacArthur Airport (ISP). From there, you can rent a car or take the Long Island Rail Road (LIRR) to towns near the coast. Dive charters typically depart from ports like Montauk, Shinnecock, and Freeport, so you'll need ground transport to your marina.

Diving in Long Island, United States, is almost exclusively shore-based. There are no traditional liveaboards operating in the area. Divers stay in local hotels or rentals and book daily charters with one of the many experienced local dive boats. This setup offers flexibility to explore the region's onshore attractions. While a few shore dives exist, the premier wreck sites are only accessible by boat, making daily charters the standard for any serious diving.