The Challenger Expedition ... trawled as deep as 26,000 feet and pulled up more than 4,000 unknown species. The strange creatures, many of which were gelatinous and didn't survive the trip ...

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 ...

The Challenger Deep is extreme in environment. The pressure is huge, up to over 1,086 bar, that is equivalent to the weight of approximately 480 cars stacked upon one another.