Minifigure: The Space Miners' Cavern

From giant crystals to strange alien creatures, The Space Miners' Cavern is full of surprises! A heavy-duty trapdoor protects the valuable energy crystals below and doubles up as a way to keep the local inhabitants from making unexpected visits to the surface (at least theoretically). 

I added lots of fun details to this scene including: giant crystals, crystal veins in the cavern floor, stalagmites and stalactites, colorful alien creatures, lime green tentacles grabbing a crate of crystals, a heavy-duty trapdoor, a detailed mining robot, and of course five space minifigures. I built the cavern base using the "Studs Not On Top" building technique, and used side connecting bricks to attach the rest of the cave to the flat surface.

Note to LEGO: I built the cavern using bricks in a couple different shades of dark gray, but if it's selected, I can use all "dark bluish gray" colored bricks if needed.