Kozlowski, 34, who lived in Ireland and was a cave diving trainer, was diving solo on Monday at Pollonora, one of a series of karst limestone labyrinths in the Gort lowlands.
When he failed to return by 9pm as planned, searches began with a number of night dives and continued yesterday, organised by the Irish Cave Rescue Organisation.
Finally one team member located Kozlowski’s body at about 7pm, having followed his laid line and gone past his stage cylinders right to the known end of the cave, at a depth of 52m and about 800m in from the entrance.
It had been hoped that Kozlowski might have found an air pocket in which he could have survived until rescued.
His body was secured in place and a procedure to extract it will now be planned.
Kozlowski arrived in the UK in 2006 and within a year was acquiring cave diving skills from top British practitioner Martyn Farr.
In 2008 Kozlowski, supported by Tom Malone, dived to a depth of 103m at Pollatoomary cave in County Mayo’s Partry mountains.
It was the deepest any cave diver had descended in either Ireland or Britain, the previous deepest having been to 90m at Wookey Hole, in Somerset’s Mendip hills.
Over 2009 and 2010, near Florencecourt in Northern Ireland’s County Fermanagh, Kozlowski managed to connect the Marble Arch Caves both to Prod's Pot in the Cascades Rising system and to Monastir Sink in the Upper Cradle system.
This established that the Marble Arch Caves meander for 11.5km rather than the previously thought 4.5km, making them the longest known system in Northern Ireland.
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