Jepp, "Tiefer" is exacly the same meaning as "deeper", I dotnt know: was "das Boot" in the english version also in German?? Fun Fact: some of the actors on this movie are well known Musik Stars today like "Herbert Grönemeyer " Myself ditnt saw the movie, but i was in the Submarine they used at the Bavaria Film Studios when i was a child..
Am I right in thinking that sight adjustment tool is the first truly new 91mm implement since the Cybertool driver and bit holder?
No, this is a 100% Victorinox design using the standard 91mm Officer Knife frame with what is, as far as I know, the first new tool added to the 91mm family since the LED was introduced in 2003.
I have updated/corrected the page and also included this diagram.