Yes there is lots of water down deeper into the Earth's crust, but...it's not a big layer of only liquid water between upper and lower layers of rock. The water is in the rock itself and highly pressurized because it has the weight of the crust above it crushing down on it. There's no giant reservoir of liquid water down there. The water is trapped in something more akin to the oil-bearing sands we extract from nowadays. It's there and it's plentiful but it's just not what most imagine it would be like.
Yes there is lots of water down deeper into the Earth's crust, but...it's not a big layer of only liquid water between upper and lower layers of rock. The water is in the rock itself and highly pressurized because it has the weight of the crust above it crushing down on it. There's no giant reservoir of liquid water down there. The water is trapped in something more akin to the oil-bearing sands we extract from nowadays. It's there and it's plentiful but it's just not what most imagine it would be like.
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