A subglacial lake is a lake that is located underneath a glacier. The largest is Lake Vostok, which is located in Antarctica.
Subglacial lakes are frozen lakes that lay underneath glaciers. The pressure from an ice cap over a lake pushes the freezing point of water to below 0 degrees Celcius, and so the lake remains liquid. These areas are a treasure trove to scientists researching how the Earth might have been in the past and how life could have survived (particularly in “Snowball Earth” a Precambrian era where the Earth was covered in ice). The water there is not stationary though, but often cycles as much water as surface lakes. There is much more information at the link below.
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