Quarry lake

But after the mining operation has been abandoned, groundwater is allowed to seep in, and rainwater collects in the quarry.

The depth of a quarry lake is dependent upon rainfall in the region.

Unexpectedly cold water[2] can cause a swimmer's muscles to suddenly weaken; it can also cause shock, cold water shock[2] and even hypothermia.

[4][2] Water-filled quarries can have dangerous electric currents in them that can be deadly under water.

[5] Geology.com cites Mine Safety and Health Administration data in saying that between 2001 and 2017, there were 201 drowning deaths in abandoned mines in the United States, or around twelve per year;[2] statistics from the Centers for Disease Control indicate that each year there are 3,960 drowning deaths.