Overview of Klescher:
Escape route #1: Ventilation fan
As a general rule of thumb, follow the blue plant. Yellow paint indicates climbable ledges.
Go towards the mining cave past the plastic curtain
Turn to the right and walk up to the window, zoom into the monitor and take a note of the passcode
Go back to the cafeteria and look towards block 1, you will see a damaged ventilation fan
Jump to the ventilation fan and enter the passcode into the keypad
Follow the path and drop all the way down to the bottom
Go straight past the blue flare and the blue plant, then turn left at the intersection
Climb onto the block with tree root and turn left
Turn right then continue straight until the end, then turn right and climb up
Follow the path and climb over the blocks in the green-lit area with the blue plant, then turn right and climb up
Follow the path straight and walk towards the end of the high ceiling cave
Climb up the ledge and jump to the ledge across behind, then do the same again and continue going up
Turn right at the blue plant intersection, follow the path until you get to a cliff
Sprint and jump towards the triangular cave, then turn to the right and jump across to the ledge
Follow the path and drop down to the ledge, then jump across the ledges in this order: right, left, right, left
Climb up and follow the path, then jump onto the damaged metal platform
Jump over to the metal platform lit by a pink flare, then turn around and jump over to the platform at the metal ring
Turn left and keep climbing up, then jump onto the platform on the left of the ring
Continue to climb up, follow the path then turn right at the intersection
Walk to the cliff then jump across to the ledge, then jump over to the dead prisoner with the pink flare
Follow the path all the way up until you reach a cliff next to the circular structure with a pink flare, the jump across
Turn around and follow the path on the right, jump to the damage platform in the middle then jump to the exit
Continue into the tunnel and look for an office window, zoom into the monitor and take a note of the two passcodes and the corresponding containers (optional)
Follow the path and until you get to the exterior, you can either be picked up by other players or continue to go up for the Ursa rover
To be picked up without trespassing (optional):
Climb the staircases all the way to the end and beware of the holes, step up onto the crate and jump to the metal platform on top of the light
Jump onto the pipe and walk towards the surface
Look around for large containers, use the passcode to unlock the door to access the Ursa rover
Drive to a safe area such as the Barton Flats Aid Shelter and be picked up by other players
Escape 3.17:
Alternate escape 3.17:
Credit to starcitizen.tools for the escape route text.
This guide forgets to mention the minefield at the end of the tunnel system. As it is still (3.17.2 PTU) impossible to crouch under the mines it is easier to just run through the whole field and let desync save the day. If it doesnt work out (occasionally you die from the mines even if you are already one or two rooms further) at least you cleared the minefield for your second attempt.