One of Canada’s most unique events went off in Nova Scotia on Saturday.

Not Since Moses, in Five Islands, N.S., on the north shore of the Minas Basin, is a race against the tides as participants run across the ocean floor for 5K or 10K. (There’s also a kids run.) What’s it like to run in the Bay of Fundy? Muddy. Very muddy.

Bay of Fundy is famous for having the world’s highest tides. According to Bay of Fundy Tourism, “twice each day, 160 billion tonnes of seawater flow in and out of the Bay of Fundy.” Time between high and low tide is approximately six hours and 13 minutes.

On Saturday, the tides were low enough, for a brief period of time, for runners to get their shoes wet and dirty. Then, as it does each year at the annual race, the water level rises and floods what was briefly the race course.

Moses, not surprisingly given the name of the event, makes an appearance at each edition of the bucket-list race.

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Well that was a muddy run! I have never laughed so hard at a race! Thank you @lockstep & Tracey!! A post shared by Joanne Kelly (@joannemkelly_) on Aug 12, 2017 at 8:29am PDT

5km turn around point for Not Since Mosses it is one of NS most scenic runs. People travel from all over the world just to take part in this amazing event. @vasquefootwear @notsincemoses A post shared by Joachim Stroink (@joachimstroinkns) on Aug 10, 2017 at 5:27pm PDT

Soggy day for a run on the ocean floor #notsincemoses2017 #fiveislands #novascotia #bagpipes #bayoffundy A post shared by Paul Williams (@pdwilsen) on Aug 12, 2017 at 6:15am PDT

Old Maid #cobequidcrush #notsincemoses #fiveislandsnovascotia #fiveislands A post shared by Phylicia Pettis (@phyliciapettis_) on Aug 12, 2017 at 7:47am PDT

The route might be a sonofabitch, but that view tho. #notsincemoses #bayoffundy A post shared by Meghan Bragg (@mghnbrgg) on Aug 12, 2017 at 8:27am PDT

Moose Island 🌊 #cobequidcrush #notsincemoses #fiveislandsnovascotia #fiveislands A post shared by Phylicia Pettis (@phyliciapettis_) on Aug 12, 2017 at 7:49am PDT

Most scenic start line ever! #notsincemoses #novascotia A post shared by Andrew Burke (@ajlburke) on Aug 12, 2017 at 5:14am PDT

Derrick Priest (29:46) and Jen Reid (35:43) were the top finishers in the 5K. Eric Travis (46:06) and Rachel Sovka (54:24) completed the 10K faster than anyone else. Full results can be found here.