Source of Deep Shadows is a doom metal band from Poland playing death/doom with elements of funeral doom. The lyrics are in both in Polish and in English. The band was found on July 2004 and in the same month they recorded 12 minutes mini-demo 'Ukryty'. This demo was released in 2006 by the Russian label Endless Desperation. It also became a split with Panamian funeral doom band Lake of Depression and two Russian doom bands: funeral metallers Quasar and their death/doom colleagues Crepuscularia.