Submerged floating tunnel
Proposals

Date
Place
Country
Proposer
link
1886
Patent N.9558
United Kingdom
Sir Edward James Reed
-
1923
Patent
Norway
Trygve Olsen
-
1947
patent pending nr. 91699
Norway
Erik Ødegård
-
1969
Strait of Messina
Italy
Alan Grant
-
1998
Høgsfjorden
Norway
Norwegian Public Roads Administration
-
April 16, 2003
Transatlantic tunnel
N/A
Discovery Channel's Extreme Engineering (Season 1, episode 3)
-
2011
Sognefjord
Norway
Norwegian Public Road Administration
-
2016
Bjørnafjord
Norway
Norwegian Public Road Administration
-
June 6, 2017
Multiple potential sites
N/A
Hyperloop One
-
?
Funka Bay, Hokkaido
Japan
Society of Submerged Floating Tunnel Technology
-
?
Lake Washington, Seattle
United States
James Felch / Subterra, Inc.
-
?
Vancouver Island
Canada
Ministry of Transportation of British Columbia, Canada
-
?
Lugano Lake
Switzerland
-
-
-
Cook Strait
New Zealand
Stuff.co.nz t
-

Question: What Norwegian patent proposals for submerged floating tunnel structures were proposed before 1950?
Answer: In Norway, a first patent on Submerged floating tunnel structure was presented in 1923 by Trygve Olsen and a new request was done in 1947 by Erik Ødegård.