The Impenetrable Containment Environment (alternatively named Indestructible Containment Environment), or I.C.E. for short, was a top secret EPF location. It was first mentioned in issue #420 of the Club Penguin Times in a classified message from The Director of The EPF. Another hidden classified message, this time from Gary, appeared in issue #436.
The following objects are on I.C.E., or used to be.
According to Club Penguin Times Issue #420, the I.C.E. had a breach where various Protobot parts went missing.
Puffle Transmogrifier (which was stolen by Herbert and modified to create the Brain Box).
After Herbert invaded the I.C.E., it was moved to a different secret location to prevent him from locating it again. This process was completed on February 28, 2014. This process is what held up The EPF Rebuild.