This might be of some use? (part way down the page)
http://www.greeka.com/greece/greece-diving.htm

hotsummer wrote:

Hi there

My boyfriend and I are hoping to go away beginning of July to one of the Greek Islands and wondered if any of them offer any diving activities?

Any info would be great!

Thanks!

Ali :tup

Hi hotsummer...

Greece has in the past placed heavy restrictions on scuba diving to safeguard undiscovered antiquities and archaeological sites around it massive coastline. In 2005 a draft bill was passed in principle lifting these restrictions but nothing seemed to happen (tis the Greek way ) However i believe that the bill has now been passed and dive sites are now beginning to open up around Greece including night diving.

Some further reading.

http://www.underwaterarchaeology.gr/Protection/index.html

http://www.underwaterarchaeology.gr/Diving/index.htm

Paul.

There are a couple of diving boats running out of Skiathos Harbour, which seem quite busy.
I have seen some good photos of them diving on a wreck on facebook.

http://www.skiathosdivingcenter.gr/
http://www.ddiving.gr/
http://www.odc-skiathos.com/photogallery.htm