the first photo is of a blueprint from 1918
but as you can see it has been updated to 1921 these
are how the bunkers are built like you read in history 1917 they are
14 feet thick reinforced
concrete outer shell
with 3 feet thick reinforced concrete walls in
there day they could
with stand
a direct hit from an enemy shell
this is a photo from the same file but this
blueprint is of the electrical system that
was put in in 1921 the
new electrical system
now allowed
the men to have light to read by
and now they didn't have to manually operate
the 12' inch guns
