Trapped Air in Undergarment Layers?

[verona]

I have a 4mm compressed neoprene drysuit. The other weeked, I had a problem getting underwater from the surface and floated back up if I got down to a a few feet. I was normally weighted for me in that suit. My buddy gave me a yank and I got under. The dive itself was fine buoyancy wise but at around 15 feet I started to float up despite dumping all air. That day I was wearing three layers under the suit and was wondering whether air trapped in between these might have caused the buoyancy problems? I had 2 very thin layers and then a thicker layer. Normally i wear a very thin layer and a thicker one on top and have not had any problems getting under, staying under or holding a stop. Any thoughts or similar experiences?

 

[Bob3]

You pretty much answered your own question; you had an extra layer of undies on, right?
It's not air between the layers, it's the air in the fabric itself.
You won't be able to squeeze all the air out of the undies, that's what makes 'em keep you warm in the first place.

 

[Snowbear]

Yeah - what Bob Cubed said
You will find when you add more insulation, you need to add a bit more weight to compensate for the extra loft.

 

[verona]

Thanks, guys. I will take a layer off as I wasn't cold - just thought I might be diving for the first time here in February!

 

[Travis*N]

Same thing happened to me when i went to a larger size drysuit. It was same model and everything, just went from L to XL, got in the water for the first dive with it and found i couldn't sink. I had to add about 2lbs to sink and now everything is fine, in fact, I think i could now remove those extra 2lbs I added.

 

[Scubakevdm]

I had a similar problem with methane being trapped in my undergarment layers. I found that eating less dairy was helpful.