New Regional Idea - Trenches!

Good day, you beautiful buccaneers!
I know people have wanted an Ice biome. However! Trenches would fit better. Considering the Sunken Kingdom tall tale, and the "Tunnels", Rare has all the assets they need to create a unique underwater environment. I would place them on the borders between each region of the map. Inside, they could have updated shipwreck loot, or siren treasures. You could encounter the sirens and battle them, or have a megalodon or kraken encounter, like the battle on the Silver Blade inside the Siren Queens fortress, as an example. Just saying, it would fit much better with current storylines and theories on regards to the Merfolk and where the megs were previously hiding before they were introduced, as well as provide new ways for players to interact and compete for treasures.