Fisch Submarine – Upgrades and How to Build

The Fisch Submarine vehicle isn’t just a simple boat! It’s a requirement when delving into the depths of Mariana’s Veil and needs upgrading to venture further.

Explore Mariana’s Veil in Fisch. Seen as how you’ll be visiting Roslit, why not check out our Fisch Roslit Bay Bestiary guide?

Fisch Submarine

Ready to start building your submarine? First, you need to head to the Submarine Depot.

Submarine Depot Location

To get to the Submarine Depot, you must head to Roslit Bay. It’s easy to spot, but it’s specifically located on the island’s northwest side. From here, look for the Dr Glimmerfin NPC, who you must speak with to obtain the Drill item. This is a primary tool in the construction of your submarine!

Find the Submarine Parts

Now, you need to use the Drill on various rocks around the Coral Reef of Roslit Bay. You need 5 Submarine Parts in total, which have a 5% chance of appearing when you drill into the rocks. You must drill into a rock 10 times for it to break.

  • Submarine Top
  • Windows
  • Back Fins
  • Metal Panels
  • Side Fins

As you have a 5% chance of obtaining each item, this process may take a while. After collecting all 5 items, you can head back to Dr Glimmerfin’s location. With the Submarine Parts, you can now construct the full submarine! The submarine is an important feature of venturing into Mariana’s Veil and it’s also a spawnable boat!

How to Use the Submarine

The submarine itself allows you to make your way into the cave system of Mariana’s Veil. You need to press the E and Q keys on your keyboard to control the ascent and descent of the submarine. You can only reach certain layers of the caves by upgrading your submarine and your suit.

Upgrading the Submarine

There are 3 upgrades available for the submarine.

  • Volcanic Vents requires the Heat Upgrade
  • Abyssal Zenith requires the Deep Upgrade
  • Challenger Deep requires the Ice Upgrade
Heat Upgrade
  • 1 Lava Crystal
    • Obtain by drilling Volcanic Vents rocks
  • 1 Blisterback Blenny
    • Mythical Volcanic Vents fish
  • 1 Infernal Iguanafish
    • Uncommon Volcanic Vents fish
Ice Upgrade
  • 1 Ice Crystal
    • Obtain by drilling Challenger’s Deep rocks
  • 1 Polar Prowler
    • Legendary Challenger’s Deep fish
  • 1 Cryoskin
    • Common Challenger’s Deep fish
Deep Upgrade
  • Angler’s Lantern
    • Exotic Abyssal Zenith fish
  • 1 Voidglow Ghostfish
    • Legendary Abyssal Zenith fish
  • 1 Abyssal Bearded Seadevil
    • Uncommon Abyssal Zenith fish
  • Have the Level 2 Glimmerfin Suit

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