Dig the ice moon, haul ore up to sell, upgrade the rig, go deeper. Something is buried nineteen miles down.
Watch the fuel. The red stripes on the gauge are what the climb home costs; turn back before the fuel reaches them.
Practice the Buried Titan. Nothing here is saved.
Drill by pushing into dirt while standing on it. Rock needs a tier-VI bit or a blast charge, and cuts slowly; the Bedrock Bite lodechant speeds it up. Magma and gas pockets bite; a radiator softens them. Ore stays visible through the ground, so plan the shaft. Bedrock seals the deep. Somewhere in the last 16,000 feet above it lies a Voltaic Core; it hums when you are close (Dowser's ember points to it), haul it up and RigWerks can fit it as a coating that bites bedrock.
Your run is always saved on this device. Signing in keeps a copy in the cloud too, so another device can continue it.
The Trophy Hall is open on the surface. Trade the heart there for a new contract whenever you like. Nothing makes you.