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The key in Sector Five is part of the Sector Five Security Countdown.

Core Zone

Sector Five had a security system prior to Season 4. When someone went into Sector Five, they had to press the key in time to access the rest of Sector Five. This key is located somewhere in the Core Zone. The User only has 1 - 4 minutes to trip the key. If the user doesn't trip it in time or leave in time, the Core Zone traps them. This has only happened once to Aelita in Exploration.

Chamber Key

After a person enters the south pole of the sector, they have to trip a key that unveils the stairs to the chamber. Unlike keys in the Core Zone, this key never changes its place and it isn't hard at all to reach. Stairs might have a time limit since the key must always be activated to make them appear again. This is the only one that still exists.

Post Lyoko's Destruction

In William Returns, it was announced that Jeremie and Aelita removed the Core Zone Key when they were rebuilding Lyoko so it wouldn't get in their way fighting X.A.N.A.. The only key that still exists is in the chamber the Core of Lyoko.

Sector Five Replika

Like in Sector Five, before Lyoko's destruction, the Sector Five Replika (with the possibility of many more of them) has a key somewhere inside it. This key is not only connected to rooms, but it also connects to the firewall trap X.A.N.A. used on the Skid. The only key appeared in A Space Oddity in which the Lyoko Warriors discovered and destroyed the Replika. The key was pushed by Ulrich, who was fast enough to find it.

Gallery

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