As near as I can tell (some of the solutions have been pretty obtuse), the patch that just came out has broken level 30 of the singleplayer campaign - you need to drill down to a crate, which was no problem when the drill depth was unlimited but the patch has given the drill a maximum depth and it just isn't far enough.

post this on the steam forum :P

To complete that mission:
1) Go left, get the drill
2) Go right, get the ninja rope
3) Use the ninja rope and enter from below (that is why there is an entrance there)
4) use the drill on either side of the cavern to lower your worm closer to the water
5) Use Armageddon.

The drill wasn't meant for you to reach the crate, but to help your worm avoid Armageddon

To complete that mission:
1) Go left, get the drill
2) Go right, get the ninja rope
3) Use the ninja rope and enter from below (that is why there is an entrance there)
4) use the drill on either side of the cavern to lower your worm closer to the water
5) Use Armageddon.

The drill wasn't meant for you to reach the crate, but to help your worm avoid Armageddon
Ah, now everything makes sense.

To complete that mission:
1) Go left, get the drill
2) Go right, get the ninja rope
3) Use the ninja rope and enter from below (that is why there is an entrance there)
4) use the drill on either side of the cavern to lower your worm closer to the water
5) Use Armageddon.

The drill wasn't meant for you to reach the crate, but to help your worm avoid Armageddon

hah. I always used the drill to reach the crate. didn't even bother using the rope. I thought that they just wanted to give you 2 different approaches to the same problem.

actually i don't know if its the patch or not cause i just began playing the campaign today but it keep spawning the worms in the wrong places i have to exit the mission and keep restarting until the worms are spawn in the correct places!