Several triathletes who took part in the Beach Blast Tri were not able to finish the race because of medical issues.
San Diego lifeguards, fire-rescue and police all responded to Fiesta Island Sunday morning.
Two participants were treated for hypothermia from the swim portion of the race, including 69-year-old Bill Arnerich of Solvang.
“I was just shaking, totally disoriented. My thoughts were fuzzy. My words were not coming out. I felt as though I was drunk,” Arnerich said.
Arnerich said his big mistake was wearing a wetsuit top and swim skin bottoms, instead of a full wetsuit.
“I thought, it’s a short swim. I’ll just brave it,” he said.
Arerich, who has been racing for nearly 40 years, said he was biking when he knew he had to quit. A fellow competitor stopped and threw a blanket over him as they waited for paramedics.
Water temperature was around 60 degrees Sunday morning. Officials said both hypothermia cases were minor.
Meanwhile, other participants were treated after falling off their bikes. Police say a tow truck driver stretched a cable across the road; several cyclists didn’t see it and flipped their bikes.