How to dip my 1/700 carrier in clear water???

I agree with Bruce, the acrylic sheet/thin plexiglass is the method I have seen most use, with success to simulate an above/below surface diorama. As I recall, Shep Paine had a diorama where he used thin plexiglass that he heated (heat gun I suppose) over a formed plaster type base that simulated the oceans surface (waves, etc.). Once the sheet took the shape, he contoured it with either clear silicon caulk or resin type substance and painted it. Nice affect. I don't have the book near me, but when I get a chance I will try and find it.
Also note, Woodland Scenics came out this last year with a product called "Realistic Water, #C1211." It is an acrylic gel and and works great (no nasty resin fumes). So everyone forget about the melting balls. Also, Woodland offers a product called "Water Effects" which has a little more structure to it so you can mold a little more texture into your water (i.e. rapids, etc.). Bought some but have not used it yet.
I hope this helps.
Dmod

Ricardo:
I have seen some nice sailing ship models where the water surface is simulated with an acrylic sheet on which the waves are done, and the lower part of the hull sits suspended below the sheet, the ship being fastened to the sheet only at the waterline.
The 'water' is held up by clear acrylic or plastic posts at the corners or along the back of the case.
This might work for you if you can find suitably thin materials for your scale.
Good luck,
Bruce

Not sure what you mean by "acrylic schemes". Anyway, you can't use the stuff (whatever they call those beads by Woodland Scenic) that you have to heat up as it will melt styrene when you pour it around the ship.

All I can think of is Acrylic Gel Medium. You brush it on in layers and it dries clear. You can also tint it. Once it's hard you can paint it, gloss coat it, dry brush, whatever.

They have different consistancy ones. With the really thick one you can sculpt waves, etc...

Liquitex may be the brand name of the gel.

James