It's definetly DOABLE -confirmed- today at the Grossadmiral level
SPOILERS!
It requires TWO 87 naval bombers placed north (last right places in the north close to Faro)
87s and the auxillary U-boat fly/swim (SURFACED!) to the eastern Allied supply ship and sink it as soon as possible (sometimes 87s are enough = have "the lucky bomb" for 7

