
thumb|upright=1.5|British First World War Q-ship HMS Tamarisk
thumb|upright=1.5|British First World War Q-ship HMS Tamarisk
Q-ships, also known as Q-boats, decoy vessels, special service ships, or mystery ships, were heavily armed merchant ships with concealed weaponry, designed to lure submarines into making surface attacks. This gave Q-ships the chance to open fire and sink them.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).