Bought this about 20 ears ago, but never really used it as in stock form it is really just a (nice looking) toy with non-proportional speed and steering. And the batteries didn’t last long. On the evening before we went on holiday, I did a quick conversion and smuggled it into my suitcase. I was so glad that I did, because it worked so well and watching this video back brings back happy memories of a great family holiday. We were so lucky that the villa came with a such a large submarine / boating pool!