Why the Queens Midtown Tunnel has doors to prevent disaster

The Queens–Midtown Tunnel was first planned in 1921, though the plans for the tunnel were modified over the following years. By the 1930s, the tunnel was being proposed as the Triborough Tunnel, connecting Queens and Brooklyn with Manhattan's east and west sides. Find out when was the Queens Midtown Tunnel built? How was the Queens Midtown Tunnel built? Why does the Queens Midtown Tunnel have doors? Does the Midtown Tunnel flood?

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» SOURCES
Queens–Midtown Tunnel.” Wikipedia, Wikimedia Foundation, 2 Dec. 2021, https://en.wikipedia.org/wiki/Queens%E2%80%93Midtown_Tunnel#:~:text=The%20Queens%E2%80%93Midtown%20Tunnel%20was,and%20west%20sides%20of%20Manhattan.

News, TBM. “Queens Midtown Tunnel Marks 75 Years.” Tunnel Business Magazine, Tunnel Business Magazine, 19 Dec. 2017, https://tunnelingonline.com/queens-midtown-tunnel-marks-75-years/.
Untapped New York, et al. “Top 11 Secrets of NYC's Queens Midtown Tunnel.” Untapped New York, 16 Feb. 2021, https://untappedcities.com/2018/01/31/top-11-secrets-of-nycs-queens-midtown-tunnel/?displayall=true.

Queens-Midtown Tunnel (I-495), http://www.nycroads.com/crossings/queens-midtown/.
“Queens–Midtown Tunnel.” Placeandsee.com, https://placeandsee.com/wiki/queensmidtown-tunnel.
“NYCDATA: Infrastructure.” NYCdata | Infrastructure, https://www.baruch.cuny.edu/nycdata/infrastructure/queens_midtown.html.
Queens–Midtown Tunnel Facts for Kids, https://kids.kiddle.co/Queens%E2%80%93Midtown_Tunnel.
“Home.” Long Island Exchange, https://www.longislandexchange.com/new-york-city/bridges-tunnels/queens-midtown-tunnel/.
Salazar, Cristian. “Queens-Midtown Tunnel Turns 75; See Rare Photos of the First Underwater Road between Manhattan and Li.” AmNewYork, 11 Nov. 2015, https://www.amny.com/transit/queens-midtown-tunnel-turns-75-see-photos-of-the-first-underwater-road-between-manhattan-and-li-1-11112395/.

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