FWIW, this is what methane at 161 atm looks like (red dot):
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Temperature looks about right for that depth.
phase | supercritical liquid
density | 129.5 kg/m^3
0.1295 g/cm^3
molar volume | 123.9 cm^3/mol
sound speed | 1084 mph
484.4 m/s
specific acoustic impedance | 62727 s Pa/m
I'm glad you posted that because i was just about to ask if anyone knows what methane looks like at 161 atm.
