 At the end of January, "U-575" was involved with in trying, in the mid-ocean 'air-gap', to rendezvous with the "Spreewald", a German blockade runner whose doctor might be able to treat one of "U123"s crew members who had been injured.On the 31st, "U-123" met "U-575", but there was no sign of the "Spreewald".She had been sunk, but it was not then known by whom.