If and when tou get a snorkel, you will need alot more than that.. water proof ignition,alternator, and either water proof seals pre-installed with replacements or replacement seals for ALL devices under water. Also all fluids must be kept in spare quanties. IF the water reaches the up limits of the snorkel the water pressure will be about 1/2 + 1 atmosphere. Most seals are designed to keep things in, and only dust and sand out.................................................................................<br><br>I know you said this was a last thing, but I was not sure if you might think that a snorkel was all there was to it. I am sure I have not pointed out every thing....... Mac