Should I drill a hole in my BB?

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My Roubaix had enough water inside it to make a gurgling, sloshing noise on lifting it on and off the wall-rack.

I took the seatpost out and inverted, but wouldn't come out : perhaps there's a BB insert shell ?
Had to rotate to get it to come up the downtube into the headtube and then across the toptube and out...

OK it's carbon, but it can't be good for the BB.
And it can't help the weight either...
 
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