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Your compass is filled with liquid. Liquid does not compress. This is why an underwater compass will have an air bubble. As you descend into the depths, the air bubble in your compass will allow for compression of the compass housing. It is normal, unless of course the bubble keeps getting larger.

Just to be clear on the discussion regarding pressure in the cabin vs the cargo bay on a commercial airliner. As an airline pilot I can tell you that both are pressurized equally. The passenger cabin and cargo hold are in the same pressure capsule. That is why the airplane will depressurize if a...

Elchido..... In my life experiences, I have found that people who shout the loudest, usually have the least to say. As a result, I tend to avoid loud people. That is an analogy which compares to your question. On a dive boat as a Divemaster, when I look around and spot the guy who has the...

ATPL with MU2, DHC8, BAe146, DC9, E-190, EA32, B757, B767 and B777 endorsements. Grew up in the islands watching guys flying for Antilles Airboats, screaming up the channel at 500 feet and splashing down next to the beach in the Grumman Goose. Was hooked! Interestingly, our airline has it's...

I am a noob to this site but as a pilot and a diver, I can say that both are 90% risk management. So what altitude will you decompress to? 8000 ft which is the typical cabin altitude of an airliner at 35,000 ft? What happens if the cabin decompresses and you find yourself instantly at 35,000...