File:Seattle - Proposed underwater tube crossing of Union Bay, 1960s.jpg
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![File:Seattle - Proposed underwater tube crossing of Union Bay, 1960s.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/38/Seattle_-_Proposed_underwater_tube_crossing_of_Union_Bay%2C_1960s.jpg/800px-Seattle_-_Proposed_underwater_tube_crossing_of_Union_Bay%2C_1960s.jpg?20110615024702)
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Categories:
- Bridges in Seattle
- Road bridges in Washington (state)
- Road tunnels in the United States
- Tunnels in Washington (state)
- Union Bay (Seattle)
- Madison Park, Seattle, Washington
- Seattle, Washington in the 1960s
- Washington State Route 520
- State highways in Washington (state)
- Proposed or planned structures in the United States