Location: Northeast of Warwick Homestead, in the ocean. Over 800 locations including Vaults, Bobbleheads, Perk Magazines, quests and more! Sign in to track your progress
The Murkwater Construction Site is a location in Fallout 4. it will lead them to a mysterious cave, an alien, and the coveted Alien Blaster (with a bunch of ammo too).
In case you didn't play the wonderful Fallout 3 DLC, or haven't been lucky enough to stumble upon them before, here's some info for you: there are aliens in Fallout 4. Home Fallout 4 alien cave location on map