That article is about an incident involving aircraft, I don't think that is what you meant to link.

It's a large, heavy object being easily interfered with.

(The parent comment said "It weighs 50 tons and is 51 feet could anything really mess with that?" An EP-3 weighs 67.5 tons and is 105 feet long.)

The same applies to submarines and a net around the propeller.

(It's also a good example of the sort of diplomatic fuss that ensues after this sort of incident, too.)

Ok, so all you have to do to interfere with the robotic sub is crash a jet into it?

Posting a link to a completely unrelated article with 0 explanation is idiotic, especially when there are plenty of examples of incidents that actually involve submarines.

The point: "It's long and heavy" isn't any sort of good reason to believe it can't be messed with. That incident also demonstrates China's willingness to play chicken with US assets.

Throw a steel cable into its prop, get too close using another sub or two, etc.