if your bomb uses any kind of electric atack (lightinig for example) make sure that airpresure is off or the stick man will die from the presure created by the spark on the ttan shell.
this bunker survived 2 of my best bombs: 1st was placed on grond lvl then detonated, 2nd was placed in the crater and detonated; the bunker failed when i placed a 3rd bomb in the crater:)