I'm probably too lazy to check the forums, so I'll just make a thread regarding all the interesting things on Torren IV. My list may be and probably is incomplete, so if you have some more, contribute.
TORREN IV (ACiT) HAS GOT SOME INTERESTING STUFF:
One insta-death, please:
To get to the Guardian, you have to grind-rail through some pipes - and you can't just walk through them - until you get Clank.
When you approach the Guardian, on your left should be a bunch of black rocks. Jump on the largest one (also the closest to the Guardian) and use the heli-pack high jump. With some luck, you should be able to reach the platform with the spring pad which throws you to the other side. You CAN, however, enter the pipe and walk through. You can see that when the pipe has a 90° split, there's nothing more than closed the door. But it gets the most interesting when you approach those two incinerators right at the beginning. You die. It's probably there to prevent you from walking instead of grind-railing. I'm not sure whether it works from the other direction, too.
In the last turn of the grind-rail pipe (the one above), there is a giant hole to your left side - a space between two pipes. There's a bunch of scrap, a screw and an interesting object. Little block of metal with a metallic arch decorated with spikes on one side is lying there. I feel like it's dang familiar, but the only thing I recall with spiked bottom jaw are the robo dogs from the original game.
From all the unimportnant junk, screws are probably the (second) most interesting. They are everywhere. I'm not talking about screws in something, I'm talking abbout normal lying screws you can't even collect. Heck, one is even lying in close proximity to the awfully familiar object.
Most interesting. Spread across the planet, you can find piles of junk with some bent decorated metal and the pirate head. It makes you wonder how did it get there, BUT - there's like 10 of them! I didn't check the Hollow, but before it and after it, you can find some. The most noticeable one is probably this one - after you fly over your ship using a spring pad, you use a trampoline to launch yourself to a higher level. Then you'll come along a pipe. Before you enter it, look to your left and there it is. Can't believe it took me so long to find it (like… 5 years?).