Yikes, gotta be confident about that one. Apparently the Oasis of the Seas is also able to retract it's chimneys (I'm sure that's not the correct word) to get a bit of extra clearance.
Video of this ship, and it's sister ship Allure of the Seas, going under the Great Belt Bridge:
Video of this ship, and it's sister ship Allure of the Seas, going under the Great Belt Bridge:
https://www.youtube.com/watch?v=9Opr17Zw11E