Right, so I just blew up the Gargantua with an airstrike, causing the Gargantua to gib. Apparently the gargs arm glitches into something and causes a crash.
Attached are a screenshot of the error popup window and the minidump.
hl2_4104_crash_2012_10_8T16_50_38C0.mdmp (102 KB)
Have you tried re-loading from an earlier save (from before the current map, at best) or just re-starting the game?
Well the crash only occurs when the garg blows up in a specific spot, so yes, earlier saves work. Just wanted to report that this kind of crash is possible and quite easy to accomplish 