ARKHAM HORROR: THE CARD GAME - INTO THE MAELSTROM ****

Arkham Horror: The Card Game – Into the Maelstrom is the final Mythos Pack in The Innsmouth Conspiracy campaign, where investigators descend into an underwater city to confront the Deep Ones and stop their sinister plans before they doom humanity. (BoardGameGeek)

Brief description:
The climactic finale of The Innsmouth Conspiracy campaign, sending investigators into a submerged Deep One city to end the threat beneath the ocean.