You can prevent the bomb activation by either sabotaging the radio equipment in the north western room or the antenna in the container area. Once you did this, you can go loud without the bomb being triggered.

Curious how others are doing this. Even with subsonic+mp5sd(or whatever) I couldn't get close before an alarm would sound. Seems like the bomb can't be disarmed once it's triggered. No angle would give me a disarm icon. I tried going left, goright far right. Etc. Eventually just gave up on the hostages.

Another gem in the Spiny Stubbles campaign. Love it :D
It was nifty with the remote detonator.