The Indian Ocean except for the period in 1942 when the Japanese carrier fleet rampaged through it, was a relative backwater compared to the Atlantic where the British devoted most of their resources. One of the reasons Doenitz sent the Type IXs and Italian boats there was the lack of Allied ASW assets in the area. That's not to say it was completely unguarded, but it was considered far safer for shipping than the North Atlantic run.
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--Mobilis in Mobili--
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