Yes
Mercury used as ballast
The USS Reuben James, an obsolete WWI flush deck destroyer (aka four piper) of the Clemson/Wickes class. The same class of vessels given to Britain under the Lend Lease Act.
(die) Viole
"Submarine" is "das U-Boot" in german. U-Boot is short for "Unterwasserboot", which means "under water boat" in english.