https://www.polygon.com/2018/5/10/17339148/battlefield-1-morse-code-bf5-never-be-the-same

On May 23, we’ll find out where the next Battlefield is headed. The obsessive Easter egg hunters of Battlefield 1 figured it out by listening to water dripping from a pipe and realizing it was Morse code.

Like most Easter eggs and ARG hunts, this one took a long time to unwind. Battlefield 1 players had long noted the locked and blocked door in the basement of the Fort Vaux map, released in March 2017 as part of the They Shall Not Pass expansion, and schemed out ways to open it. Two days ago, they did — see the video above — realizing that the key to unlocking the door was breaking signs and flipping switches in a certain order, one that spells out “isolement,” which is French for “isolation.”