At the southernmost part of the NSWF property, there is a crescent of beach, bordering Peconic Bay.

It is named Submarine Beach in honor of its former role as the location for trials of the first US Navy submarine, the USS Holland. This area was also used as a commercial site for loading oysters and scallops onto boats moored in Cutchogue Harbor and the underwater rail tracks remain to this day. This is not presently a swimming beach, but as finances allow, NSWF hopes to clean up the underwater area to make it safe for water access, and possibly as a location for oyster and clam growing. Now the beach can be used to view Wednesday Night races at one of NSWFs picnic tables, or as a place to put down a blanket and umbrella and enjoy the sun, sand and incredible views.