Chances are it could of buggered off to the Gong for the day and nobody would of noticed it. When evolution has had your species swimming around non stop for thousands of years you tend to be good at it and very efficient. When they are swimming from South Africa to Australia and back in 6 months i dont thing it would be much more than a gentle stroll to get them that far. It could be holidaying in New Zealand this week for all we know.

Matt