A techno-thriller really well-done, I could not let go until you have finished! Although at times I was a little lost in the explanations on mathematical calculations (I admire those who understand it all at once, lol!), It is well written and without much impact on the overall reading, it never lasts long enough to want to jump the passages in question. The situation (in the bottom of the ocean) of the "Service" is such that even if we know it's going to end badly (obviously) it is hooked to the pages and you can not help but turn. The background of the story is exciting from beginning to end, and surprises are worsening as and as we approach it. Now this is a little "big" and even if the doctor "Ping" annoyed me a bit (complaining of dizziness when you are in a survival situation, it's stupid), bah too bad, it must not hide his pleasure when you come across a great "page-turner" like that! :-)