If you're not in an S-class sub, then you should definitely be able to make it to Australia with 30% of fuel, possibly even Midway or Johnston Atoll(if available). The most efficient speed, however, is not 5 knots, but around 9.5 depending on the sub type. Just plot the course and set the speed to 9.5 knots, then click "max range at current speed" and "range to course end", and see if you can make it. If in doubt, refit in Australia before heading for home.
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