Tunnel-diving RPG UnderRail has its own waterworld as of today, as creators Stygian Software released an expansion named Expedition. Taking place partway through the base game, it opens up a giant underwater lake called the Black Sea (no, not that one), over and around which players can scoot on a range of jetskis, and fight sea drakes, pirates, and dormant robots, and meet a society of boneyard dwellers.
This "secondary campaign" adds over 250 areas, three new weapon classes, and a heap of new character feats, items, and craftable gubbinses. A trailer entrails below.
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