NO. Dangerous advice. At anything other than just below the surface the air in your trapped car or your lungs has been compressed to sufficient degree that you are likely to get an embolism if you hold your breath. You have to gently blow out...not hold your breath... as you surface.
WARNING & DISCLAIMER:
SELECT AND USE OUTDOORS AND SURVIVAL EQUIPMENT, SUPPLIES AND TECHNIQUES AT YOUR OWN RISK. Information posted
on this forum is not reviewed for accuracy and may not be reliable, use at your own risk. Please
review the full WARNING & DISCLAIMER about information on this
site.