U-Boats, World War 2 and Puerto Rico

A video about the comparatively small role Puerto Rico, notably Mona, had in World War 2, as a result of the U-boat campaign by (reprehensible) Nαzi Germany.
TIMESTAMPS
0:00 Intro
0:05 Context
1:00 Battle of the Caribbean
2:25 Attack on Mona, Puerto Rico
MUSIC
Beethoven - String Quartet No.6, Op.18 No.6 (Performed by Belcea Quartet)
imslp.org/wiki/Special:Revers...
REFERENCES
U-boat Maps: uboat.net/maps/caribbean.htm
[1] www.usni.org/magazines/procee...
[2] Hasslinger: www.history.navy.mil/research...
[3] Cheerio: uboat.net/allies/merchants/sh...
[4] Pillory: uboat.net/allies/merchants/sh...
[5] Rouse: tiboko.com/wp-content/uploads...
[6] Oxford oxfordre.com/latinamericanhis...
[7] NYT: timesmachine.nytimes.com/time...
VIDEOS
Hoover in Puerto Rico: archive.org/details/0947Param...
Torpedoing Clip: archive.org/details/Safeguar1941
IMAGES
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[@GrandAngel]

Yet another banger, Fro-man!!

[@FroyourHistory]

Much appreciated dude B)

[@Nomaddev]

Another Froyour classic, great vid:))

[@FroyourHistory]

Thanks a bunch dude

[@user-wq5so3mw4o]

which submarine?