Well we all saw them get buried alive but I highly doubt that will be the last we've seen of them.
When Paulo was trying to bury the diamonds Locke said something along the lines of "Don't try to bury whatever your burying there as the tide will dig it up" Or whatever. Surely this is a hint towards the tide coming in and the sand eroding away.
Another idea is that they didn't attually get buried we saw Nikki's eyes open && the next thing we saw was the hole had been filled. If Nikki had her eyes open they surely Paulo had his open as he was bitten first. (Maybe it was a continuity error but I like the idea)
I've got to say I enjoyed this episode as it gave Paulo && Nikki a bit more depth. I did have more to say but I've totally forgot what it was
