ah trifold, my love!
A neat extraction mission with a cool time-based complication - get out before the lava makes your objectives impossible.
I did have a little trouble understanding exactly what happens if the lava goes into the tube - does it just flood the tube in that area, or all areas downhill? Does the lava keep flowing across the surface level as well?
That being said, very cool. Great job at creating multiple sources of pressure to get to SILVERFISH quickly.