For the source text click/tap here: Bava Batra 76
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By (Torah) law, when one pays money, he acquires the object. The Sages, however, established that movable objects should be acquired by lifting, pulling into one's domain, or taking control over them.
If the ship is on public grounds, one cannot pull it into his domain; therefore, the seller can give control over it to the buyer. If the ship is in an area people can use as their own, the buyer should pull the ship into his domain.
We explore the two scholars who researched nautical issues in the Talmud, Daniel Sperber and Rafael Patai.