The rare sight of a giant squid swimming inside a marina was captured on video on the cost of the Sea of Japan.

According to a manager at the Mizuhashi Fisherina in Toyama prefecture, about 250 kilometers northwest of Tokyo, one fisherman found a 3.7-meter (12.1 feet) giant squid swimming beneath fishing boats docked at the marina on the morning of Dec. 24.

“It was the first time that we saw a live giant squid here, where water depth is only about 2.5 to 3 meters,” said Tatsuya Wakasugi, a manager at the marina.

According to the National Museum of Nature and Science, giant squids are known to live 650 meters to 900 meters below sea level. Mr. Wakasugi said there were a little more than a dozen giant squids captured in the Toyama Bay since the beginning of the year, but all were dead or nearly dead when they were caught in the fishing nets.

“Whereas the ones caught in fishing nets are mostly dead and their colors have already turned white, the body of the giant squid swimming inside the marina was red,” he said.

The squid, which appeared to have some scratches on its head, stayed inside the marina for several hours, at times swimming alongside divers. It was led toward the open ocean later in the day, Mr. Wakasugi said.

It’s unclear why the giant squid wandered into the marina since the weather and sea conditions were fair, according to Mizuashi Fisherina.

There was another unique finding in Japan earlier this year related to giant squids. The Museum of Nature and Human Activities said researchers caught giant squid babies for the first time in the world off the coasts of western and southwestern Japan.

Below is footage of the giant squid in Toyama from Japan's ANN news.