Blowing Ballast

Whilst on a recent trip to the Caribbean, this humpback whale surfaced close to the boat I was on. At the time the whale reminded me of an old submarine in a war movie – with the water gushing out of it’s mouth as if it was ‘blowing ballast’ to surface for the fresh air above. Unlike submarines though, humpback whales have to surface for a breath of air around every 20 minutes or so. Quite often they will surface a lot sooner than that, unless they are on a deep dive for food or whilst travelling for example.

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