建築物位於小山丘旁，大體分為上下兩部分。繞到山丘上，可以從「大西洋辦公室」牌子地下的牆洞進入。建築內部是一些損壞的終端，The first sub-level has multiple holes to the basement; one is booby-trapped by a pair of laser tripwires. The lowest floor can be accessed in one of two ways: either by falling through the hole in the floor in the eastern room, or by jumping down the elevator shaft and using the hatch on the elevator cart. 建築內部的敵人有幾隻屍鬼。
The second floor is accessible by walking up the hill around the building and entering through the hole underneath the "Atlantic Offices" sign. The elevator shaft is accessible here, and there are several holes in the floor that lead to the main level. There is a room with a locked security door here that is controlled from a nearby terminal.
小島 ·阿卡迪亚 ·Aldersea Day Spa ·原子之神泉水 ·Beaver Creek Lanes ·Briney's Bait and Tackle ·Brooke's Head Lighthouse ·Children of Atom shrine ·Cliff's Edge Hotel ·Cranberry Island Bog ·Cranberry Island Docks ·Cranberry Island supply shed ·Dalton farm ·DiMA's cache ·Eagle's Cove Tannery ·Eden Meadows Cinemas ·Echo Lake Lumber ·匕港鎮 ·Fringe Cove docks ·Glowing Grove ·Haddock Cove ·Harbor Grand Hotel ·Horizon Flight 1207 ·Huntress Island ·Kitteredge Pass ·Longfellow's cabin ·MS Azalea ·Nakano residence ·National Park campground ·National Park visitor's center ·National Park HQ ·Northwood Ridge Quarry ·Oceanarium ·Old Pond House ·Pine Crest Cavern ·Radiant crest shrine ·Rayburn Point ·Red Death Island ·Rock Point Camp ·Ruined church ·Southwest Harbor ·The Nucleus ·The Vessel ·Vault 118 ·Vim! Pop factory ·Waves Crest Orphanage ·Wind farm maintenance ·Zephyr Ridge Camp
