Dr Beach reviews a new science paper about mercury build-up in sea mammals.

Our dive reporter Terri Allen gives us the lowdown on what's involved in learning to dive - what to look for, what to avoid - with summer fast approaching and the water temperatures on the rise, this is a segment you won't want to miss!

And Bron pays homage and tribute to Dr Bill Ballentine, NZ marine scientist and global pioneer in marine protection legislation who sadly passed away during the week.