Also the altimeter works on air density, so it will show you as climbing when you may actually be in a steep descent.
In one TV documentary it showed that methane will choke out an airplane engine - since it is a volitile, flammable gas I thought it would rev it up, but tests indicate otherwise.
They said something about electromagnetic interference which would compromise radio distress signals or some instruments.
Interesting stuff.
Apparently when this methane "ice" melts or converts to liquid, and that liquid gets up to where the lower pressure allows it to "boil" into gas, the ocean essentially cuts a huge, explosive "phart". That's the theory anyway, although as far as I know no one has ever wittnessed one... and lived to report it.
I wonder if one of our spy satellites will ever document one of these events?
As an energy source, it bears investigation - although mass production might be a bit of a trick what with all of that mega-pressure involved.
We have plenty of regular, garden variety bacteria that routinely generate methane; that's what "biomass" is all about.
That "technology" has been around for millions of years, at least.
The Chinese apparently put a big sliding dome over the village cesspool and tap off the methane trapped under it for heating and cooking.
It ain't rocket science.