It was a wooden one, painted blue.. so maybe one of those CHEP pallets.. must have been close to sinking cos the whole top was covered in them too.
I guess the ironic thing is that that more barnacles grow on it the heavier it gets and eventually sinks an sends them all plumeting to their deaths in the deep (unless they wash up on a beach and die, like this one)
Thanks for the ID F15hguy.. No they were all alive and swaying around trying to find water no doubt. It was on our way back we saw it so must have washed in just 10min max before we saw it.