"At one stage I had water up to the seat on the bike, but managed to pull the bike out and kept the engine running. Quite a few other riders had issues and I think I had a bit of luck go my way."
Runner-up to Groombridge on Saturday was Wainuiomata's Jake Whitaker, with Tokoroa's Jake Wightman third overall on the day.
Groombridge has certainly proven himself the man to beat in New Zealand these past couple of seasons, his impressive string of results surely enough to make his rivals weep.
He took a Suzuki RM-Z450 to finish fifth in the MX1 class at the motocross nationals in 2016 and he rode a Suzuki RM-Z250 to claim overall runner-up in the MX2 (250cc) class in the motocross nationals earlier this season, finishing behind Auckland's defending champion Hamish Harwood, but ahead of Australian visitor and former Grand Prix racer Jay Wilson.
As well as winning the enduro crown for the first time in 2016, Groombridge won his first national cross-country crown that year too, then backed that up by defending his cross-country title in 2017.
He then wrapped up the 2018 national cross-country crown at the final round of the series, near Mosgiel a fortnight ago – making it three successive national cross-country titles – before switching back to endurance mode of the enduro nationals event near Nelson on Saturday.
The final two rounds of this year's enduro nationals will be a double-header weekend, day one set for the Santoft Forest, near Bulls, on June 9, and the fifth and final round of the competition set for Martinborough the following day.