The Challenger’s Deep bestiary is the second bestiary you can complete while visiting the cave system under Rosilt Bay inRoblox’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.
In addition to the nine fish that are included in the Challenger’s Deep bestiary, you’re able to 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 tocomplete 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 thefollowing 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 theWinter 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 beaccessed through the northwest tunnel. Here are the preferences of the local fish:
Any
Rain
It will be difficult to catch all the fish, so don’t forget touse totemsto change the weather conditions or time of day. Also, don’t forget to use the specified bait or at least thebest baityou have.
Also, in the depths of Challenger’s Deep lives a fish ofsecret rarity - Frozen Leviathan. Catching it is not easy and requires not only skill but also patience because thechance of spawning is very low. To increase your odds, try to create the ideal conditions in which Frozen Leviathan usually appears:
The same as the Magma Leviathan in Volcanic Vents, theFrozen Leviathan in Challenger’s Deep is not part of the local bestiary, so you can complete the collection without catching it.