CaveBlock: allows you to see through the walls
There are a lot of different thypes of cave blocks, you can change thype by using a Stonecutter
-Forge : 1.16.5 ; 1.18.2 ; 1.19.2 ; 1.19.4 ; 1.20.1
-Fabric : 1.20.1
-NeoForge : 1.20.1