At first I used a chair to try to get into the vent, wouldn't work. Then I read that aiming the rocket at the vent was the solution. Then I got so sick of failing to get through the vent, I noclipped.
I see you have returned, Edcrab. Your sequel gets more exciting every chapter! I hope you have some more pictures and drawings and such for the story, I still have trouble visualizing everything in your world of Malign Contingency.