Wladimir Klitschko was rescued by Spanish coastguard after the yacht he was on board caught fire in Mallorca.
The former heavyweight world champion was on holiday with his family and friends before flames appeared and they needed help.
The fire was quickly put out and everybody escaped unhurt.
He posted a message, accompanied with a video, on social media to share his experience of the incident.
"Be careful what you wish for: fate took my wish for "some adrenalin" a bit too literally and our boat-trip Sunday night ended up in our boat igniting and family & friends being evacuated by coast guard and fire rescue-team. No worries: we are all fine!" the Ukrainian wrote on Twitter.
The 43-year-old retired from boxing in August 2017 after turning down a lucrative rematch against Anthony Joshua following their Wembley Stadium bout.
However, he's been linked with a sensational return to boxing with reports claiming DAZN have offered him a mega-contract.
But WBC champion Deontay Wilder isn't keen on facing the legendary heavyweight.
"Na. We'll still have to see what he does, let him get back in and build him up," he said when asked if he'd like to take on Klitschko
"Look, Klitschko, when he fought [Anthony] Joshua, he was out for two years and he came back and lost the stuff so he got to build himself back up.
"He can only live off his name for so long. You get to the point where [you're no longer] that fighter that you used to be.
"I can't say used to be somebody because he's still somebody, he's still Klitschko, he did amazing things in his career and you can never take that back. Even when I went to camp with him I learned a lot of things from him So you can never take that from him.
"But the fighting scene, when you come back, you gotta build yourself back up. Especially against someone like me, because I'm coming in for the kill. I ain't playing around with nobody."