Why isn't the lake frozen solid?
Answer is thermal energy from tectonic processes. Cite: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi...
http://lptms.u-psud.fr/membres/trizac/Ens/L3FIP/Ice.pdf
Even an extremely high pressure cannot melt ice at -25 °C, but skiing is still possible at that temperature.