If you got the Season Pass for Fallout 4, you’re in for a treat. Bethesda has declared that the upcoming Far Harbor DLC for the game is bigger than even Shivering Isles, the expansion for The Elder Scrolls IV: Oblivion. In case you haven’t played Shivering Isles (what sort of a Bethesda fan are you?), it’s very, very big. Big enough to fill 54 hours of playtime, according to HowLongToBeat.com.

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The statement about the DLC’s size comes from Pete Hines, Bethesda’s VP of PR and Marketing. To be fair, his comment is a bit vague, and does not say whether he’s talking about the map size, the the number of missions, or what. Here’s the tweet in question:

When the first round of DLC was announced for Fallout 4 last month, Bethesda made it clear that Far Harbor is the largest add-on they have ever made for a video game. Of course, they hadn’t said then if they were counting full expansions as “add-ons” too, but now it seems like they were.

Far Harbor follows a new case from Valentine’s Detective Agency, in which players head to the island of Far Harbor, off the coast of Maine. Expect synths, Children of Atom and more in your elusive search for a young woman gone missing. Far Harbor is priced $25, and will be released in May 2016. It is included in the Season Pass, so you do not need to purchase it separately if you already own the Season Pass.