Readers will no doubt be familiar with the name of Ivan T. Sanderson who, along with Bernard Heuvelmans, was one of the founders of cryptozoology. All sorts of other Fortean phenomena captured his imagination, if not always his critical faculties, with the result that he founded the Society for the Investigation of the Unexplained (SITU), with its journal, Pursuit. Now, in my old age, I am going through my own copies of this journal, and thus happened to come across an article inspired by a clipping from a Japanese newspaper. So, as this blog seeks to rescue stories which are likely to get overlooked or lost, I shall republish it here verbatim. The comments at the end were, I presume, written by Sanderson himself. As for the last sentence, there does not appear to have been any follow-up. And no, I have no idea what the animal was. If any reader is an expert in large marine life and has any suggestions, they are welcome.