How are blue whales dangerous?

Answer 1

Blue whales are "gentle giants" and pose little threat to anyone. They are generally timid and any incident would be simply be due to someone getting too close and being hit by the uge bulk of the whale.

The only way Blue whales can be harmful is when they have a calf just like any other mother in the world the will do anything to protect it.

Answer 2

Depends on how you look at it. There are really two parts to all such questions:

1) what can the animal actually do to you

2) how likely is it to happen

Blue whales as such has no interest in humans. They can't eat us, and a single human can't hurt them. But they are big and powerful creatures, and can easily knock a human out or worse with a swipe of a flipper or tail. Or capsize a boat.

So, if you should get in their way, they can be dangerous, but if you keep a safe distance, you'll be fine.