Mare Island Dry Dock, LLC. operates on an 18+ acre site of land. The site, located on Mare Island, is the home of both Dry Do ... ck #2 and Dry Dock #3. Both are active concrete graving docks with the largest capacity being a length of 700 feet. Both Dry Docks can accommodate ships under fully loaded conditions. Mare Island Dry Dock, LLC. has a secure berthing of up to 1,300 linear feet. read more