Korea and Japan has history. Over 1500 years of cultural exchange, trade and military conflict has shaped an affinity and a rivalry that goes from love to hate and back.

In the days before the start of the 1964 Tokyo Olympics, before they would face off in men’s and women’s volleyball, the two nations were facing off in the high seas. On Monday, October 7, 1964, according to The Japan Times, a Japanese fishing boat was stopped by a South Korean patrol ship. The Korean authorities were attempting to stop the Japanese boat from fishing in what South Korea claimed were their territorial waters.

The seven Japanese fishermen were escorted onto (taken prisoner by?) the South Korean patrol boat. Apparently the seas were rough, and the two boats collided, creating damage to the fishing boat. Eventually, the 77.5 ton fishing boat, named No. 58 Hoyo Maru, sank.

The Korean boat also suffered some damage and apparently a Korean coast guard was sent to do repair work, according to The Yomiuri. The man fell into the water, but was fortunately picked up by another Japanese fishing boat close by. A second Korean coast guard was in a boat looking for the first one and found him being cared for (captured?) on the Japanese boat, and boarded (was taken prisoner by?) the Japanese boat.

Which set up the “prisoner exchange”.

When the Japanese realized that the Koreans were holding 7 Japanese fishermen at the same time the Koreans realized that the Japanese were holding 2 Korean coast guard personnel, they probably thought they had spent enough time in the tense choppy waters of the Pacific Ocean. A trade was made and all parties went to their respective homes.

But this maritime battle would continue for another year, until the approval of the Japan-Korea Fishery Agreement in 1965. Until that time, nearly 4,000 Japanese had been arrested and over 300 Japanese boats by South Korean authorities. Additionally 44 people had died in these fishing conflicts.

The Japanese men’s and women’s volleyball teams handily defeated their South Korean opponents, but you can bet the fans and the teams in those matches were a tad more pumped up to sink the players on the other side of the net.