"Fallout 4" update is an accidental discovery. 

The "Fallout 4" video game has just been recently released but there is so much to do and try out in the game. Apart from the numerous mods that can either provide entertainment or make playing the game much easier, there are some things that can't be manipulated. 

A recent "Fallout 4" update, discovered by VG24/7, happened when one Redditor, named FiveStarFacial55, accidentally fell into the ocean depths and decided to explore the area for a bit. It came as a surprise that he didn't only discover a beautiful interactive underwater environment, but there was also a mysterious structure with working lights. As for loot, he only got a pot.

However, the mysterious structure is a "Fallout 4" update that many are puzzled over and are speculating that this could be a new expansion of the game. The structures exists along with lights but there isn't a door in sight. This could be part of Bethesda's plans later on.

While some may think it is a prank, the Redditor documented his underwater exploration and uploaded it on Imgur. The gamer also plotted the coordinated for those who were curious to see the underwater structures for themselves. 

"Fallout 4" is an open world action RPG video game developed by Bethesda game Studios where first and third person perspectives are available. It is the fifth installment and the much-awaited addition into the "Fallout" series. 

The game is set in a post-apocalyptic Boston 210 years after a nuclear war has left the world in destruction and made human beings go underground in the safety of a bunker called a Vault. Players can freely explore the world inside the game, as well as complete quests to acquire experience points to level up their character.