If you recently logged in to the server you have noticed that you can't spawn anything. This is because Hey0 has not updated his mod to go with the new minecraft mod that Notch released today. Until the mod gets updated you will have to play without them. Sorry for the inconvenience.
I just blew a hole in my current project by placing tnt, which i thought i could remove using the stick, long story short...
BOOM!!!
BOOM!!!
try being stuck in the spawn
i logged off at an underwater -64 altitude place. its enclosed, FML