Swimming? No Floating? Only for a short period. But my guess is he's not going to get it going for a while unless it's a diesel. If he can purge the engine. Then the trick is sorting out the electrical problems afterwards. Saltwater and anything with power in it is a bad combination. Btw. Is that Jesus behind the wheel? If so. He should have walked instead.
That isnt a swimming car, its a car thats stuck in some water. THIS: is a swimming car! What cant you do with a HumVee!
Or you could do it for real: http://www.gibbstech.co.uk/humdinga_4x4.php Want to go underwater? How about a lotus? http://jalopnik.com/356461/rinspeed-squba-bonds-lotus-submarine-made-real