HALF CROSS SECTION Y-Y
HALF CROSS SECTION Z-Z
![[Larger illustration]](#1436564578684219714_illo298alg.jpg.id-7700873838177879710.wrap-0.html.html){kind=link}
HALF HORIZONTAL SECTION X-X
HALF TOP VIEW
Fig. 151.—Cross-Sections and Plans of the Detroit River Tunnel.
![[Larger illustration]](#1436564578684219714_illo298blg.jpg.id-2484407506459500125.wrap-0.html.html){kind=link}
Steel masts had been previously attached to each end of the sections to enable the engineers on shore to determine the alignment and locate the exact position during the sinking.
Concrete was then deposited in the pockets, completely surrounding the tubes, forming a solid monolithic structure from end to end.