The second layer or landmark added in Mariana's Veil update is the Challenger's Deep. You will visit this area right after visiting the Volcanic Vents and upgrading your Submarine to level 1. Here, you can catch a total of 10 fish, each with unique bait and timings, as mentioned below.
How to find the Challenger's Deep in Fisch
As mentioned earlier, the Challenger's Deep is the second landmark in the Mariana's Veil Update, which can be reached after getting the Heat Upgrade. You can do this by providing the following materials to the podium in front of the Innkeeper in Volcanic Vents.
- Lava Crystal
- Inferno Hide
- Blisterback Blenny
- Infernal Iguanafish
Once you submit these items, you will receive the Glimmerfin Suit as a gift and an upgraded Submarine, which should now be orange in color. Descent and travel to the GPS Location (-865, -3280, -640) to find the Challenger's Deep POI.
How to catch all the 10 Fish in Challenger's Deep
Below, you can find all the ten fishes one can catch in Challenger's Deep, along with their bait, timing, and season requirements.
Frostscale Fangtooth
| Description | A blue and white colored fish with fangs |
| Type | Common |
| Suitable Bait | Bagel |
| Weather | - |
| Time | Day |
| Season | Winter |
Cryoskin
| Description | A skin of a fish? |
| Type | Common (I Suggest using Garbage Bait) |
| Suitable Bait | None |
| Weather | None |
| Time | None |
| Season | None |
Chillshadow Chub
| Description | A black and white fish with a lot of blue pointy objects at the edge of its body |
| Type | Uncommon |
| Suitable Bait | Insect |
| Weather | Clear |
| Time | Day |
| Season | - |
Subzero Stargazer
| Description | A white and blue fish that looks dead to me |
| Type | Uncommon |
| Suitable Bait | Flakes |
| Weather | - |
| Time | Day |
| Season | Winter |
Deep Freeze Devilfish
| Description | A turquoise-colored fish that looks like a goldfish |
| Type | Unusual |
| Suitable Bait | Squid |
| Weather | Rain |
| Time | - |
| Season | Autumn |
Iceberg Isopod
| Description | A very old icy and white colored Isopod that is still alive |
| Type | Rare |
| Suitable Bait | Minnow |
| Weather | Windy |
| Time | Night |
| Season | Winter |
Cryo Coelacanth
| Description | An Ancient black and blue fish that looks beautiful and ugly at the same time |
| Type | Rare |
| Suitable Bait | Shrimp |
| Weather | Clear |
| Time | - |
| Season | Autumn |
Polar Prowler
| Description | A dark, icy, and light blue prowler fish that looks mystical |
| Type | Legendary |
| Suitable Bait | Truffler Worm |
| Weather | Clear |
| Time | Night |
| Season | Winter |
Chillfin Chimaera
| Description | A Chimaera that belongs in the Encylopedia |
| Type | Mythical |
| Suitable Bait | Fish Head |
| Weather | - |
| Time | Night |
| Season | Winter |
Frozen Leviathan
| Description | A white and dark blue shaped Leviathan that is a secret fish |
| Type | Secret |
| Suitable Bait | Worm |
| Weather | Clear |
| Time | Night |
| Season | Winter |
For more on Fisch, Check out How to get the Submarine in Fisch – Drill, Obsidian Rocks and More or All 9 Fishes in Ashfall (100% Bestiary) – Fisch
