When he moved to Ireland, Kozłowski was a qualified diver, with 13 warm open water dives under his belt. Shortly after his arrival he became interested in underwater cave exploration, and began learning cave diving with the Welsh cave diving instructor Martyn Farr in 2007. He began diving in the Hell Complex, part of the Green Holes group of underwater sea caves off Doolin, County Clare and initially used the area as a training ground for his newly acquired skills. He soon began exploring and mapping undiscovered passage, and by July 2007 he had made his first significant breakthrough, making the first traverse between Hell's Kitchen and Robertson's Cave in the nearby Reef Complex.
Exploration
Kozłowski was responsible for many extensions to cave systems in both Ireland and Spain, the most notable being the extension to the Marble Arch Caves system. In 2009 and 2010 diving connections were made to nearby cave systems by Kozłowski, firstly to Prod's Pot – Cascades Rising, doubling the total length of the system from 4.5 to, and subsequently to newly established Monastir Sink – Upper Cradle system, extending the wider system further to. The discoveries make this the longest cave in Northern Ireland. In 2008 he set the record for the deepest cave dive in Great Britain and Ireland at a depth of in Pollatoomary, near Killavally, County Mayo, Ireland. Perhaps his most notable achievement was the exploration of over of underwater passage in the notoriously unforgiving cave passages of the Gort region, including the discovery and exploration of Pollindre, 1 km in length and the third deepest sump in Great Britain and Ireland at. In March 2011 Kozłowski received the Kolosy award for cave exploration at the annual Polish travelling and outdoor sports conference, held in Gdynia.
Writing and public speaking
Kozłowski was a passionate advocate of exploration and diving; his blog recounted in detail his underwater adventures. His latest discoveries filled the pages of the journal Irish Speleology and Descent magazine. He was also an engaging public speaker; his January 2011 talk at NUIG/GMIT Sub Aqua Club was well received.
Death and legacy
Kozłowski died during a cave dive in the Gort lowlands on 5 September 2011. His body was successfully recovered on 10 September 2011 after an extensive recovery effort over several days by a team including Rick Stanton and John Volanthen. The cave in which he died is called Pollonora 10, in the townland of Kiltartan, Gort, County Galway, Ireland, and his body was found at the then known limits of the cave, at a depth of and approximately from the entrance. On 15 September, Kozłowski was buried in the nearby cemetery after a service at St Attracta's church, attended by gardaí, divers and members of the Irish Cave Rescue Organisation, friends, family and members of the local community. In August 2012, in recognition of his contribution to Irish speleology, the Speleological Union of Ireland set up the Kozłowski Fund to support original cave exploration in Ireland. In 2013, a fundraising page was set up in order to pay for a headstone for Kozłowski 's grave in Kiltartan, and for a plaque to be erected at the entrance to Pollonora 10. The plaque and headstone were engraved by a Gort-based stonemason and on 6 September 2014, marking the third anniversary of Kozłowski's death, the gravestone and plaque were unveiled to a gathering of friends and family.
