I'm not sure exactly what you mean by putting the heat rock under the dirt. If its not plugged in, you can put it anywhere, but I wouldn't plug it in and then bury it. Apart from safety concerns in doing that, snakes sometimes burrow down to get cool - they don't expect the ground to get warmer as they burrow.
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0.1 Ball Python, 0.1 Creamsicle Cornsnakes, 1.0 Amelanistic Cornsnake, 1.0 Ghost Cornsnake, 1.0 Motel Amelanistic Cornsnake, 1.0 Okeetee Cornsnake, 0.1 Striped Amelanistic Cornsnake, 0.1 Silver Phase Miami Cornsnake, 0.1 Sunglow Cornsnake
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