Undercarriage opening during flight

[JohnnyRocket]

Is it possible for the undercarriage to be opened on a commercial jet at high altitude? 30,000ft+ ?
Does the opening of the undercarriage affect the overall pressurisation of the aircraft?

[Mr @ Spotty M]

Yes it is possible at reduced speed, U/C bays are not pressurised.:ok:

[TopBunk]

Yes it is possible, although maintaining altitude with the increased drag may be a problem!