Almost
"I said "Almost" because Earth is mostly too warm for liquid CO2. By the time you're deep enough for the pressure to hold in the gas (around 75 atmospheres/950 psi), the temperature has risen past the critical point of CO2 (31.1 C) and the material can no longer be distinguished between liquid and gas. It is a supercritical fluid."
What about in the ocean? +950 psi is common presssure in most of the ocean. When test drilling for oil offshore have liquid CO2 deposits ever been found?
-gb