(Trent Nelson | The Salt Lake Tribune) Zion National Park, Saturday Jan. 12, 2019. tunnel(Trent Nelson | The Salt Lake Tribune) Zion National Park, Saturday Jan. 12, 2019. tunnel(Trent Nelson | The Salt Lake Tribune) Zion National Park, Saturday Jan. 12, 2019. tunnel(Trent Nelson | The Salt Lake Tribune) Zion National Park, Saturday Jan. 12, 2019. tunnel(Trent Nelson | The Salt Lake Tribune) Zion National Park, Saturday Jan. 12, 2019. tunnel(Trent Nelson | The Salt Lake Tribune) Zion National Park, Saturday Jan. 12, 2019. tunnel(Trent Nelson | The Salt Lake Tribune) Zion National Park, Saturday Jan. 12, 2019. tunnel