I dropped my camera bag in the sea last weekend at Whitby and lifted it out immediately but my Sigma 10-20mm fell out. Didn't notice at first, so a couple of minutes totally submerged. When I fished it out I literally poured water from it by shaking it.
Anyway a week later and it is almost dryed out, too soon to say what the damage is, but it is working. Took some pictures today of an area of grass to see if I could spot any marks on the picture and it looks good. I'll do a proper test in a few more days when it has finished drying out - but it does look like it is going to be useable again - totally amazing.