Atlantic Divers, an independent club based in central Scotland, ran the event in aid of Cash for Kids, which supports deprived Scottish children.
Based at the Quarry View Tearoom, just north of Furnace on the northern shore of Loch Fyne, some 60 divers, unaffiliated or from varied diving organisations, gathered last October in high winds and rain.
They maintained a 24-hour relay in which buddy teams stayed under water for 40 minutes at a time, ensuring that there were at least two divers under water for a full day, from noon to noon.
It took a while to collect money pledged to the cause, but the £8800 coffer was finally completed and announced on 11 January by the delighted management team.
Logistics for the marathon included a 12-strong support team, first-aiders, boat cover and topside lighting. Under water, a 60m-long weighted line was set along the loch reef at a depth of 10m.
Marked with tags and light sticks, this allowed divers to stretch their fins without risk of losing contact on swapovers. The course was connected by rope to a surface buoy, via a 6m-deep deco station.
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