What would you do if you saw a huge whale heading directly towards your boat?
Tourist Eric Mouellic posted this footage of one of the colossal creatures slipping under his whale-watching boat in Quebec, Canada.
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The start of the footage shows the whale surfacing a fair way away from the boat. The whale then disappears back under the water's surface, only to reappear much closer this time.
It then appears to duck-dive under the whale watching boat, coming so close that its fin seems to hit the side of the vessel.
While most of the tourists seem to be squealing in delight, surely a few of them are a little scared? We would be!