Five keeps his eye on the container Wrath seals, frowning in thought. Fighting the dead is one thing, but how do they counteract something that's growing under their feet?

"That was our theory. It leaked from their sacks and bore holes that sank them." Potentially spreading the water and triggering what happened today, but that's possibly a leap too far. Considering the source, it could have just as easily been the other way around. "The men there also said they were delivering the grain to Matthias."

Which is the main reason Five went to see the ships for himself. He never got his answers to why Matthias wanted the water, but it is proof that he's planning something.