I find it funny that Trapped Under Ice on expert you're actually doing more than what Lars is (kick drum hits are twice as fast)
Man, there is a lot going on in with the feet in that song, with lots of fast double kick that you cant easily hear in the recording.
And go on people, bag out Metallica as much as you like, but theire first four albums were life-changing for me (and millions of other metalheads, btw) so this is one bandwagon I wont be jumping on. Master of Puppets is a killer album, even by todays standards.