Detpack

Explosive Type Blast
Explosive Power Loads!
Damage Radius 20
Carried By Demoman
This grenade is carried only by the demoman. The purpose of it is to blow away certain obstacles on certain maps. It is the only grenade capable of doing this. The demoman gets one detpack per life. The detpack can be set for 5, 30 or 50 seconds - 5 is enough for you to get away so you won't be hurt by the blast - use the other times if you don't want to give away your position.

Make sure you know on what maps this is required - if you are playing a demoman it is likely that other classes will ask you to blow the enemy tunnel / grate / etc - if you don't know where it is just ask someone to show you. The ultimate use for it has to be on cz2. If you manage to get into the enemy flag room you can blow it with a detpack and they'll lose all their captured flag points. Thats massively satisfying but hard as hell to do.

Finally, a scout can disarm a detpack by touching it so keep an eye out once you've planted it.