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> 今闘技場にいる観衆は外に出すな、モンスターが脱走したことを悟られ **てもいかん** ！

What meaning does いかん have in this sentence? I've never seen this before.
CC BY-SA 3.0
2015-10-25T04:17:49.790
28856
2015-10-25T05:00:15.570
2015-10-25T04:21:41.437
10316
question
grammar words
What does ても＋いかん do?
いかん is short for いけない.

> Don't let the audiences in the arena go outside. It is not good if they
> notice the monsters have escaped.
CC BY-SA 3.0
2015-10-25T05:00:15.570
28860
2015-10-25T05:00:15.570
8010
28856
answer