Save your surface, find your underground adventure!
Caves that extend deep underground, stretch horizontally and are spacious are conducive to hiking exploration.
Now the canyons are bigger, and more dynamic
New underground looks! Neat, and massive. now you mainly go down by "subway", and may encounter other caves.
rails going through a lush cave
rails going through a sulfur cave
Added a new minecshaft entrance, with rails!
A dungeon connected by a cave passage, to a large cave
A cave passage connecting a dungeon
Deeper, bigger!
Grand rift valley and intact surface, YES!
Ridiculous holes and gaps ruining the surface, NO!