Shirtless Zac Efron and brother Dylan get wet and wild during summer day at the lake

Zac Efron and his brother, Dylan Efron, got wet and wild while enjoying quality time at the lake.

The siblings took to Instagram to share glimpses of their summertime adventure alongside Dylan’s long-term girlfriend, Courtney King.

One video shared by the “Traitors” alum showed the group taking turns jumping off a boat deck into the water.

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“Describe summer in one word,” the 33-year-old influencer wrote over the video.

Zac, meanwhile, shared a carousel of photos showing himself driving the boat, riding on a wakeboard and diving into the lake.

The actor, 37, was also seen drying off with a blue towel, while a fourth snap showed him and Dylan lounging in the sun.

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A sunset video showed the brothers putting on white cowboy hats.

Zac didn’t appear to be fearful of the water despite his “minor swimming incident” in Ibiza, Spain, last August.

According to TMZ, the “Greatest Showman” star was pulled out of his villa pool by two workers and taken to the hospital.

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The outlet reported that he had “ingested a large amount of water into his lungs” and showed “signs of distress.”

Zac’s rep told the outlet that he was “fine,” adding that he was taken to the hospital as a “precautionary measure.”

The “High School Musical” alum, however, brushed off the incident by sharing a photo of himself working out via Instagram one day later.

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“Happy and healthy,” he wrote over the clip. “Thanks for the well wishes.”

Dylan, meanwhile, proved he was quite the swimmer after saving two drowning women in Florida, he shared .

He recalled the incident on an episode of “Brooke and Connor Make a Podcast” in April, saying, “I just looked around, and there’s no lifeguards around … So I swam one in, swam back for another girl.”