From OpenwaterpediaTsugaru Channel between Honshu and Hokkaido in Japan. He uses a Swim streamer on his boat when escorting solo swimmers and relays across the Tsugaru Channel. He escorted Oceans Seven swimmers Darren Miller of the U.S.A. and Stephen Redmond of Ireland across the Tsugaru Channel as well as Masayuki Moriya of Japan and several Japanese relay teams. He is the lead escort pilot for the Tsugaru Channel Swimming Association and Ocean Navi.
Captain Mizushima helped build the Seikan Tunnel, the underwater tunnel of the Tsugaru Channel early in his career.
- Isshin Denshin In The Open Water
- Breaking News on Stephen Redmond
- Stephen Redmond Achieves Oceans Seven
- Stephen Redmond and Captain Mizushima
- Ocean Navi Takes Team Across The Tsugaru Channel
- Tackling The Tsugaru
- Tsugaru Channel Swimming Association
- Open Water Swimming
- Marathon Swimming
- World Marathon Swimming Association