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Dan Kimball and Marcus Barton are a very experienced and accomplished team, and they were in a tight race for the menís podium throughout the day.
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Earlier that day, following a half hour delay due to heavy fog the race got underway on Chebeague Island with a 1.8-mile run.
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Matthew Hurley and John Stevens from Portland, Maine, arrived on the rockiest section of the course at Vaill Island with sizeable lead on the other teams.
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The second team to come ashore on Vaill Island was the mixed team of pro triathlete David Thompson and Bridget McCoy from Minnesota.
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Teams pacing over the rugged terrain on Vaill Island.
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The exits and entries of some of the swims required careful attention to footing.
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A womenís team experiencing some of Casco Bayís natural habitat following the longest swim passage of the race.
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Racers are welcomed to Peaks Island after a 1700-yd swim with an aid station and enthusiastic spectators.
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On Peaks athletes, including married couple mixed team Bronwen and Gregory Dierksen, tackled the longest run of the day, a 3-mile run across the island.
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Womenís team Sara McLarty and Misty Becerra used Casco Bay Swimrun as a final tune up for Otillo in three weeks.
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Teams strung out on Seashore Avenue on the way to Torrington Point on Peaks Island.
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Barton and Kimball taking on nutrition before the swim leg from Torrington Point to Cushing Island in the later stages of the race.
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The winning menís team Hurley and Stevens at the finish line.
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The winning mixed team was Thompson and McCoy with their lobster buoy awards.
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The winning womenís team Erin Hunter and Emily Finanger at the finish. The teammates also finished third overall in the field of 120-plus teams.
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A steady stream of teams were equal parts elated and tired at the finish.
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Twin sisters Anna and Grace Senko and Kristen Connors and Molly Lunn all smiles at the finish.
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Michael Collins and Tim Vibrock came from Texas to compete.
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Maryanne Dunfey and Katrina Zelenski were the last official finishers of the day.
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Staff Sergeant Travis Mills was one of only five quadruple amputees from the Iraq and Afghanistan wars to survive after an IED explosion in 2012. His foundation is building a retreat in central Maine for other Veterans and was the raceís charity partner.