- Hokkaido tour boat salvage decision due by end of May as cause of sinking eyed The Japan Times
- Vessel for Deep-Sea Diving Leaves for Search Site off Hokkaido Nippon.com
- Operator of sunken Hokkaido tour boat used cost-cutting ham radio: sources – The Mainichi The Mainichi
- Unmanned submersible joins search for missing passengers off Hokkaido NHK WORLD
- High-tech ship joins search for people still missing in Hokkaido boat tragedy asianews.network
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