20 Leagues Under the Sea

20 Leagues Under the Sea is a quest in Fallout 4.

Quick walkthrough
After the passing the Alien in the Cave, you have to take 14 steps to the left. After, you will have to wait for the song "The End of the World" by Skeeter Davis. Then you have to wait until Wednesday in real life. *side note* You may also opt to change the PS4 settings so you don't have to wait for Wednesday.

Behind the scenes
This quest's name is a reference to the 1954 movie and the 1870 book by Jules Verne 20,000 Leagues Under the Sea.