US vs. German subs - which was better?

[Torplexed]

Originally Posted by Letum

I'm sure use could have been made of the VII boats.
A supply ship extends the range up to 3 times (a refuel on the way there
and one on the way back).

How easy would it be to refuel a sub in the pacific?
Is it easy to hide a cargo ship there free from attack?

I suppose you could base the Type VIIs out of Australia as was done with many of the S-Boats. They'd still have the range to strike the Solomons or the Dutch East Indies. The US tried to keep tenders in the South Pacific well out of range of possible land-based Japanese air attack. That's why they ended up in Fremantle and Brisbane.