The Royal Navy is soon to be equipped with submarines which are limited in the duration of their undersea operations only by the food on board (and the mental attitude of the crew, but I’m assuming that’s pretty much unbreakable).
Today’s invention is a large scoop which acts like a whale’s mouth filters, periodically catching enormous amounts of sea life, both animal and vegetable.
This would be pumped inside via a pressure lock, cleaned, microwaved and automatically processed into various, food-like forms by a special machine. By the addition of small amounts of flavourings, and mixed with existing food stocks, these might be made sufficiently attractive to sailors to prolong their missions significantly if required.
