The only way I can think of to do it, without being stuck in TCx1 is:
Get a visual on the convoy.
Dive.
Follow with hydrophone until contact is lost.
(Usualy 2 Hours at TCx64 will do).
Surface.
Catch up.
Repeat as neccesary.
(It can still be quite time consuming).
Note on using Flank Speed:
This should only be used for VERY brief periods, for an emergency.
It's the equivalent of climbing in your UNGOVERNED car, and holding the throttle to the floor.
You may get away with it for a minute or two, but sooner or later after that you will eventualy hear B A N G, as your engine blows.
Full Speed is the fastest your engines are designed to run.
(The speed gained by using Flank is usualy not more than 1 Knot anyway.
And it sucks up the fuel, big time.)
A Steam Turbine powered warship can get away with this with comparrative ease, as compared tp our Diesel Powered uboats.
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