The survival server (survive.mineinabyss.com has been reset a couple days ago, with better server hosting and an upgrade to 1.15.2!

Here is a quick changelist of some other features and what you can expect soon:

• Added the fifth layer
• PVP is now only enabled in layer 4 and 5
• KeepInventory is off in layers 4 and 5, replaced by graves that drop on death. Only you can open your grave, and you can have up to 5.
• Removed/reduced nausea from many layers
• Fixed unmanaged sections and teleporting into overworld
• Walled off the abyss with bedrock
• Disabled frost walker in layers 4 and 5
• Improved flying mob AI
• Better ores spawn deeper down in the abyss

Here are some things you can expect for the future:

• Craftable relics
• Regional curse strength (edges and random pockets of the abyss will have weaker curse
• Fancy custom mob AI