The Challenger’s Deep bestiary is the second bestiary you can complete while visiting the cave system under Rosilt Bay in Roblox’s Fisch. After getting a submarine upgrade in Volcanic Vents, you can visit Challenger’s Deep, which is opposite to the previous location, and instead of lava, it is completely covered in ice.

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In addition to the nine fish that are included in the Challenger’s Deep bestiary, you can also catch the secret Frozen Leviathan there, which is very difficult to obtain. Apart from that, you also need to know how to get to Challenger’s Deep and the preferences of the local fish, which we will tell you about below.
How To Complete The Challenger’s Deep Bestiary
To get to Challenger’s Deep, you will first need to complete all the tasks in Volcanic Vents, namely upgrading your submarine, which requires collecting fish and crystals. If you have already done so, then get in your submarine and head to the entrance of this location, which is situated at the following coordinates: -2630, -3830, 755.
Since Challenger’s Deep is an icy cold cave, you will definitely need to keep yourself warm, which will be greatly helped by the Winter Cloak or the second-level Glimmerfin Suit.
To catch the fish from the bestiary, you should get to the pool, the entrance to which can be accessed through the northwest tunnel. Here are the preferences of the local fish:
Fish |
Bait |
Season |
Time |
Weather |
---|---|---|---|---|
Frostscale Fangtooth |
Bagel |
Winter |
Day |
Any |
Chillfin Chimaera |
Fish Head |
Winter |
Night |
Any |
Cryoskin |
Any |
Any |
Any |
Any |
Polar Prowler |
Truffle Worm |
Winter |
Night |
Clear |
Chillshadow Chub |
Insect |
Any |
Day |
Clear |
Cryo Coelacanth |
Shrimp |
Autumn |
Any |
Clear |
Subzero Stargazer |
Flakes |
Winter |
Day |
Any |
Iceberg Isopod |
Minnow |
Winter |
Night |
Windy |
Deep Freeze Devilfish |
Squid |
Autumn |
Any |
Rain |
It will be difficult to catch all the fish, so don’t forget to use totems to change the weather conditions or time of day. Also, don’t forget to use the specified bait or at least the best bait you have.
Also, in the depths of Challenger’s Deep lives a fish of secret rarity – Frozen Leviathan. Catching it is not easy and requires not only skill but also patience because the chance of spawning is very low. To increase your odds, try to create the ideal conditions in which Frozen Leviathan usually appears:
- Weather – Clear
- Time – Night
- Season – Winter
- Bait – Truffle Worm
The same as the Magma Leviathan in Volcanic Vents, the Frozen Leviathan in Challenger’s Deep is not part of the local bestiary, so you can complete the collection without catching it.

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