In the new RUST what is special about caves?

In the new version of RUST what do caves do? Do they have special resources? Can bases be built in them? What play elements do they add? What strategies do they expose?

You can build a base inside a cave.

This can be quite strategic, as there are only two ways in. Therefore, if you are being raided, the enemies will only be able to attack from two directions.

Since posting this (and I'm scoring you TL since you beat me on this) I have gained experience on the caves.

Pluses

Cave walls are indestructible

• Caves have limited entrances
• Caves can be fairly deep (I have been in caves that exceed three "wall levels"). Levels can extend above and below "local ground level" giving you "exterior walls" that are quite high

Minus

• Cramped quarters can make item placement difficult
• Cramped quarters can make rooms difficult to navigate
• Since you are building on "rock" there can be many places that you can not place foundation so some interior placement may be unstable

General Info

• There are no special items in caves
• There are barrel spawns near caves
• Sighting of caves can be difficult
• Because of their defensive value caves can be hotly contested immediately on server reset
• Because of their defensive value caves are not hotly contested "mid-game" as you are probably going to have to blow several armored walls to get to anything valuable