digging a hole/ lowering the ground...

am installing a cave dwelling but want to drop the ground inside of it a bit. Have used the lower tool but it stops after a while, is there a way to dig??

If you are on a mainland sim then you are probably limited to +/- 4 meters. If it is an estate sim then it could be set however the estate manager wants it.

thank you, will check into that

If the "lower" terraforming tool ceases to affect the terrain past a certain point, you've hit the lower limit for terraforming in that sim, on that parcel location. If it's Mainland, that limit is as far as you can go, and you can't go lower, period. LL will not change those limits.

If you have land on a private Island sim (You pay a monthly rent to another Resident, rather than actually paying Linden Lab directly as tier), then the sim owner has the ability to adjust the limits for terraforming. If you ask nicely, they can probably help you there.

Another way you could do it, is fake the terrain to your bidding. Either sculpty or even normal prims. If your on the mainland, look for an identical set of textures by comparing the terrain textures inside the Library in your Inventory. If your on a owned island though and it uses a custom terrain texture, you will have to see if you can ask for the terrain textures. Or ask the owner for higher/lower terrain limits.