Batman Arkham Asylum riddle help?

USSR 4 LIFE

New member
I beat the game but i still need to complete the riddler challenges. the only ones i need are in the guard room (the one where Harley Quinn had the guards hanging over the electrified pools of water) and i cant get in. one of the doors is sealed because of the gas and another one is one of those electric barrier doors and the control mechanism is out of range of the Cryptographic Sequencer. is there another way into the room?
 
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