Deep depths

The deep depths would be in underwater caves leading far down where its realy dark to the point its pitch black. At this level your not alone... Underground sea mobs such as angler fish and others. the angler fish deals 6.5 damage when it bites you due to the sharp edges it has on its teeth. If you get in its way, it attacks. When you know it's near is when you see a small light that's dangling in front of it. When you kill it, there is a chance it drops its light and you can obtain it to see in the deep. Another mob is the blind octopus. It spawns at the bottom of the floor. Its blind due to no light for hundreds of years. It touches its surroundings to get to where it needs to go. When your near it; it senses that your there, when that happends it starts moving around to find you. When its tentacles touch you, it grabs you and then eats you leaving to a instant kill. When you kill it, it drops nothing. But there is a chest where it spawned. When it spawns you can either sneak around it to the chest, or you kill it. The octopus is big so it makes the deep depths more challenging. The last mob is the jellyfish. The jelly fish doesn't drop anything. But it glows and comes in variant colors. When you touch it you get nausea for 4 seconds, poison for 5 seconds and a new effect (stun) when you get this effect from the jellyfish you cant move for 2 seconds... This new update could perfectly fit the caves and cliffs update, since there are underwater caves!