- Giant squid definitely exist but are almost never seen alive. Only last year year did researchers finally get some pictures of a live one. And that was from a submarine 2950 feet below the surface.
- There have been just a handful of reports of squid attacks on boats in the last 200 years.
- Shigeo didn't report feeling the violent motion, or shaking, which accompanied the other reported attacks.
- Giant squid suction cups are usually about 5 cm. Some of these seem bigger. Some of the edges are blurred, suggesting the cups moved around in the same general spot, enlarging the "footprint". But even some of the sharper outlines are bigger than 5 cm.
This squid would have to have stayed with the boat for weeks and weeks. The other reported attacks lasted for minutes. Pros
We can't think of any ocean junk that would leave this kind of pattern. Barnacles and seaweed don't leave these marks. We've never seen fishing floats that would do this. We can't think of any other natural phenomenon that would make such marks. On the other hand, they look just like those squid suckers.
- Shigeo's keel and rudder are pretty streamlined. There's nothing much that would catch and hold a fishing net or other garbage, unless it tangled in the prop. But there was nothing in the prop.
- A squid on the rudder would certainly explain why the boat was hard to steer. And why the autopilot reported "weather helm." And a squid could explain why some of Shigeo's water intakes stopped working intermittently.
- Shigeo was sailing through a very fertile piece of ocean, known for its population of sperm whales. Sperm whales eat giant squid. And often have scars from the suckers."