Fast thorium in DM

[Jaguar]

I'm really sad cause ive been searching for 45 min and i cant find a post that i came across one day which removed the doors in Dire Maul (one in the main room that tree normally has to unlock after killing bosses, and other one at end to get to the thorium) well i cant find it ANYWHERE =( so maybe if one of you guys could remake this for me id appreciate it =) but also i remember it saying for some reason there was no throium when it was used maybe cause u need to kill bosses? who knows' so maybe an alternative route would be great like lowering ground to that tunnel? idk use your imagination please =)