In return for ending unrestricted submarine warfare, Germany wanted the sinking of all Allied supply ships, regardless of whether the respective nation was at war with Germany.
A submarine is a watertight vessel that can navigate the oceans like a ship. Tanks for holding water are provided. When a submarine dives, water is added to the water tanks to make it heavier and raise its average density over the density of saline water, which causes it to sink.
On February 1st, 1917, Germany resumed unrestricted submarine warfare, with the primary objective of sinking all Allied supply ships, regardless of whether the respective nation was at war with Germany.
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