For the private wiki only accessible to Club Penguin staff, see I.C.E.
The Impenetrable Containment Environment (originally referred to as the Indestructible Containment Environment), or ICE 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.
In issue 420 of the Club Penguin Times, it is implied the Herbert Statue was transported to ICE.
After Herbert invaded the ICE, 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.