Almost four years after its original launch, Stygian Software has released a massive new expansion for their retro-inspired CRPG, UnderRail.

The Expedition expansion adds a lengthy new story arc set in and around the Black Sea, a giant underground ocean. The new region brings with it many new types of enemies, including savage tribes, pirates, and vicious wild animals.

You can travel from island to island in an upgradable jet ski, and even use it to fight in naval battles. There’s also an increased level cap and plenty of new skills and feats to expand your character’s abilities. You can check out a trailer for the expansion above.

Here’s a rundown of the new content:

This DLC expands the base campaign with many new waterway maps that connect various harbors of the Underrail as well as adds huge new region called the Black Sea, a massive underground body of water. Take a break from the usual metro-crawling to take a boat to this infamous place. There, among the old and mysterious ruins of an age long past, you’ll face the vicious fauna, hostile natives, cunning pirates, and something far more sinister than all of those.

Your voyage through vastness of the Black Sea will shed new light on the history of the world of Underrail and the forces that shaped it.

Key features:

• A brand-new story line that becomes available during the mid-game, which you can play your own way as no decision or hostile action will lock you out of completing it
• Nearly 200 new areas to explore of various types – shores and islands of the Black Sea, mysterious underground facilities, pirate strongholds, and more
• Many new wild creatures and a couple of new crazy robots to combat
• 15 different jet skis, ranging from the puny “junk jet” up to the dreaded “Devastator”, that you can use to get around the Black sea and outmaneuver or obliterate your naval foes; upgrade your ride by purchasing more powerful vehicle parts
• Three new distinct weapon types – shotguns, swords and spears allowing for a number of new play styles
• Many new items, some obtained through crafting and some found in the world
• New psionic skill, Temporal Manipulation, that focuses on delayed damage and utility
• Specialization points that are obtained on each level past level 15 that allow you to further improve your feats
• Leveling past level 25 and up to level 30 with a special pool of feats to choose from
• Over 30 new regular feats

UnderRail: Expedition is available on Windows PC via Steam and GOG for $9.99. In case you missed it – you can find our review for the original game here (we recommend it!).