Markku Siltanen

Markku Siltanen is a structural analyst and engineer employed by the National Consulting Group, and the protagonist of the game. He is commonly referred to as Mark, as he considers it easier to pronounce than his actual name (Mark has a sticky note outside his office stating "When in doubt, call me Mark"). He speaks with a heavy accent, and talks to himself under certain circumstances.

Mark was assigned to survey critical infrastructure around the Hammer Valley Dam and the nearby Bergmann Water Tunnels.