Thank you guys!
MBT70, pics on the first page seem to work still... If not - let me know - I'll send them to you.
The article on making water is a good idea, although I dont think I will be able to tell you anything new... This method is old and was described several times by other modelers.
The base of my dio is a mix of styro-foam and plaster. First of all I did not cut the bottom of the sub - it still is a solid hull submerged into (or surrounded by) lots of little pieces of Styro-foam glued together with white glue. I would say its pritty much the same method as model train layouts with mountains, valleys and othe relief...
When basic wave "layout" was set, everything was covered with layer of plaster. Actually I used just a cheap wall compound from closest Home hardware store and I spreaded it using a kitchen spoon :-)))))
After 24 hours everything was painted including the sub. Top of waves with lighter shades of blue/grey - bottom of the wave - darker shades. I used to work at sea on container carrier so I had to spend A LOT of time on the deck and on the bridge watching all kinds of waves and squalls :-)
When the paint job is done I put 3 layers of Realistic water by Woodland scenics.
The final step was to imitate all the water coming off the sub's hull. I used all sorts of crap - pieces of plastic cover for the cakes, stretched clear plastic sprue, clear rubber glue (dont remember the brand)...
Thats about it...
Andy