This means that (glacial) ice melts, leaves the gas hydrates and sediment in the lake, and then freezes as H2O.

174

The density contrast between these waters will cause the circulation.

159

As ice flows across the lake, deep within the ice sheet, the internal layers diverge from the ice base in the south of the lake and converge to the ice base in the north. Thus, ice must be added to the ice base in the south and taken from it in the north.

141

Now you have to accept that there will be communication between the lakes.

66