Everything to Know About Desolate Deep in Fisch
The Desolate Deep is one of the most expansive and dangerous cave systems in Fisch, located behind Sunstone Island. It features mines, rare fish, advanced equipment, hidden paths, and high-stakes fishing zones, such as the Desolate Pocket and Brine Pool. This eerie underwater area is home to 13 unique fish in its bestiary, many of which require particular bait, seasons, or weather to catch. If you're aiming to complete your Desolate Deep journal or unlock the Trident Rod, this guide will help you get there.
Also Read: How to Get the Trident Rod in Fisch (2025 Guide)
Summary - Desolate Deep Guide
Desolate Deep is behind Sunstone Island, accessible via a buoy at GPS: -790, 125, -3100
You need either Basic or Advanced Diving Gear to access it
The Desolate Deep Bestiary includes 13 unique fish
Completing the bestiary unlocks the path to Trident Temple
Coral Geode and Phantom Ray are the most rewarding and accessible
Use a lantern and high brightness to avoid naval mines
Coral and Volcanic Geodes are efficient Truffle Worm sources
Brine Pool offers a separate fishing zone with its own rare fish
How to Get to the Desolate Deep
Swim behind Sunstone Island until you spot a floating buoy near coordinates (-790, 125, -3100). This marks the entrance to the underwater trench that leads to Desolate Deep. You'll need at least Basic Diving Gear to survive the descent, although Advanced Diving Gear or a Submarine is highly recommended.
Once underwater, you'll reach a fork with two tunnels. The left leads to a small cave with a Merchant where you can purchase Flippers, Crab Cages, Reinforced Rod, and more. The right path takes you to the Desolate Pocket—the main area of Desolate Deep, where most fishing, item purchasing, and progression happens.
All Desolate Deep Sublocations
The Buoy: A small surface point that marks the descent zone. You can also buy Advanced Diving Gear here.
Tunnels: The descent splits into two tunnel paths. The left leads to basic fishing and the right to Desolate Pocket.
Desolate Pocket: The core of the Desolate Deep. This area has a large fishable lake, Clarence (Merchant), an Inn Keeper, and a teleport mirror that warps you back to Sunstone Island for free. You can also purchase Flippers, Gliders, Coral Geodes, and more here.
Brine Pool: Reachable by climbing and gliding from the Desolate Pocket. Fishing here requires a Reinforced Rod or better. The pool is deadly; geysers can launch and kill you instantly.
Trident Temple: After completing your Desolate Deep bestiary (excluding Brine Pool), you can power five Enchant Relic pedestals at -1470, -240, -2550 to access the Trident Temple. Inside, you can buy the powerful Trident Rod.
Fish Found in the Desolate Deep
There are 13 fish required to complete the Desolate Deep Bestiary, including Phantom Ray, Coral Geode, Banditfish, Barbed Shark, Emperor Jellyfish, and Sea Mine. You’ll need to fish during specific times, weather conditions, or seasons, and use the right bait for each.
Completing the bestiary rewards you with an Infested Bobber, 2,000C$, and 2,000XP. This completion is also needed to access the Trident Temple. Coral Geode is one of the best catches value-wise and mutation-wise.
How to Get Coral and Volcanic Geodes
Coral and Volcanic Geodes are some of the best sources for Truffle Worms. Coral Geodes are sold at the Desolate Pocket shop for 600C$ and have a 14.29% chance per crate to contain one. Volcanic Geodes are pricier and less consistent but offer a 6.25% drop rate and cost 4,097C$ per Truffle Worm equivalent.
Coral Geodes are also catchable in both Desolate Deep and Brine Pool areas using Magnet bait. They have a high resale value and are an efficient option when farming Truffle Worms or Coral items.
Brine Pool Overview
Brine Pool is a high-risk, high-reward area reachable only with a glider or Tidebreaker. Once inside, you’ll find rare fish like Brine Phantom, Spectral Serpent, and Dweller Catfish. The area is dangerous—small geysers on the walls can kill you if touched. Use the Reinforced Rod or Invincible Enchanted Rod to fish here safely.
Also Read: Megalodon in Fisch: Location, Catch Chance & Tips
FAQs About Desolate Deep in Fisch
Q: What do I need to access the Desolate Deep?
A: Basic Diving Gear at minimum, but Advanced Diving Gear or a Submarine is highly recommended.
Q: How do I get to the Brine Pool?
A: Glide from the highest rock platform in the Desolate Pocket, heading toward the northwest crevice.
Q: What's the reward for completing the Desolate Deep Bestiary?
A: Infested Bobber, 2,000C$, and 2,000XP.
Q: Can I get Truffle Worms from Coral Geodes?
A: Yes, at a 14.29% chance per crate. They're one of the most efficient Truffle Worm sources.
Q: How do I enter the Trident Temple?
A: Complete the Desolate Deep Bestiary, then place five Enchant Relics at -1470, -240, -2550.
Final Words
The Desolate Deep is not for the faint of heart, but it’s one of Fisch’s richest locations for gear upgrades, rare fish, and high-profit catches. Mastering it requires preparation, gear investment, and attention to detail. If you're chasing the Trident Rod, Coral Geodes, or rare fish like the Sea Mine and Emperor Jellyfish, you’ll need to get familiar with every tunnel, vendor, and geyser this dangerous zone has to offer. Good luck, and don't forget your lantern.
“ GameBoost - Filip Premuš is a seasoned gaming content writer specializing in titles like Steal a Brainrot, Old School RuneScape, and other popular online games. With a sharp focus on accuracy, updates, and in-game strategy, he creates comprehensive guides that help players stay ahead of the meta and make informed decisions.”
