Markku Siltanen
| Character of INFRA | |
 | |
| General | |
|---|---|
| Name | Markku "Mark" Siltanen |
| Status | Alive |
| Gender | Male |
| Appearances | All of INFRA |
| Voiced by | N/A |
| Job | |
| Company | NCG |
| Position | Structural Engineer |
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. Player will never see his face, even in the mirror (Which is put as a joke in the first ending with a sticky note on a mirror saying "You're a vampire Mark"). His face however is visible on the "The Engineer" Poster.
NCG
Mark is an employee of the National Consulting Group, and is most likely a senior engineer, due to his office overlooking the rest of the city.
Story
Mark was assigned to survey critical infrastructure around the Hammer Valley Dam and the nearby Bergmann Water Tunnels.