Here is my problem: after T3-M4 opens the way to the mining tunnels and gets shot, the new scene loads, but without the main character, instead I am still T3-M4 (though I am adressed to as the main character in the dialogue). I can't go to the mining tunnels, the transition won't happen (probably for lack of the right varibables being set on the character). I've reloaded the game to a save before opening the hatch quite a few times, no luck.

Any suggestion would be welcome

Thanks

Sounds like quite a glitch you got there. I would suggest starting a new game, since you weren't that far anyway. If that doesn't work, maybe it's the game that's corrupted. Good luck, mate

Use the update link in your game... and Update to the later