The deepest channel of this kind which has been dived through is located at the bottom of the deepest pit in Croatia , Lukina jama , at the depth of 1392 meters and 57 meters long .
Najdublji takav kanal koji je i preronjen nalazi se na dnu najdublje hrvatske jame , Lukine jame , na dubini od 1392 metra i dugačak je 57 metara .