National marine sanctuary offices and visitor centers closed to the public; waters remain open

NOAA's national marine sanctuary offices and visitor centers are closed to the public while the waters remain open for responsible use in accordance with CDC guidance and local regulations. More information on the response from NOAA's Office of National Marine Sanctuaries can be found on

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Diving Conditions

Diving offshore is unlike diving at a similar depth closer to shore. In addition to the deep water, you will likely experience strong currents at the surface and the bottom, especially if the wind and current are moving in the same direction. Plan your dive around slack tide for the best underwater and surface conditions.


In addition to standard scuba gear, divers should consider carrying a reel and lift bag to make ascents if separated from their down line and a safety sausage and whistle or other surface signaling devices.

A completely redundant air supply is also advisable. Since the seafloor water temperature rarely rises above 50°, drysuits make diving safer and more comfortable.

Another hazard divers may encounter is fishing gear. Gill nets in the water column pose the greatest threat to divers because they are hard to see and are hard to get untangled from. Additionally, monofilament line, lobster pot lines, and trawl nets can also ensnare divers. Be particularly aware of your surroundings if you are close to boats actively fishing since they might not be aware of divers under the water. It would be wise to carry a second knife or cutting device so you can free yourself if you become entangled and cannot reach your primary cutting tool.


It is essential that your dive boat flies a red and white diver down flag and the blue and white international dive flag since the sanctuary is frequently transited by both American and foreign flagged ships. Also be aware that portions of the sanctuary are located in the shipping lanes for vessel coming into or out of the port of Boston.


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