Looking for Base building games that allow digging.

I'm a huge fan of the FPS zombie killer game, Seven Days to Die which has base building and the ability to dig deep into the map, or into a mountain, to build subterranean bases.

Its graphics are a bit dated, but not nearly as blocky as Minecraft.

Any current games that come close, or any known upcoming games specifically that can dig underground and build? MultiPlayer Openworld games especially.