You decide that this will be your chance, and silently hope that your skills won't be as rusty as you might think. While Edgar and Kevier are tugging over the canteen, you turn around to face them, and edge out the axe out from your bag very slowly. It rubs against the leather with a tiny scrub, and the weight gives away. You try to catch it as it falls, but it nearly slips away from your fingertips. Fortunately, your reflex takes over and you catch it in time before it hits the ground.
The guard manages to pull off the canteen from Kevier rather clumsily, cursing angrily. "You lousy thing! You'll better regret asking stuff from me!"
Before you can attempt to cut your bonds, you notice that the guard starts to eyeball at you, "What're you doing there?"
As swiftly as lightning, you swing your body around, holding out the sharp edge of the axe towards him. He is too surprised to react and got hit in the side, dropping whatever he is holding. Moaning in pain, he tries to return a punch. You dodge away from his blow and swing your axe again. He receives another painful hit, and tumbles to the floor. Clearly he looks terribly wounded, and he struggles to keep himself up.
"You traitor... you are a shame to our kind... This... will not end until...."
Before he can finish, Kevier lunges himself towards Edgar and tackles his face. He falls unconscious, and his eyes close.
"Now that's for torturing me with dehydration!" Kevier squeaks, "Uh, I hope he's not dead already."
You saw off the ropes tying you up for a minute, and then Kevier's. After you're done, the elevator is already reaching its destination soon. You tell Kevier of your plan disguising as the guard. "Sure thing, that makes everything so much easier. You're such a genius! But that unconscious guard here... will be "you" then? You can't leave him alone, or else other guards will discover his whereabouts, and our undercover plan will be busted. You should bring him along too, and just pretend that you knocked him out. But don't tie me up please, the rope is giving me itches."
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Tevokkia's plan sounds great (Autofire takes some credit too). But of course, nice try guys!