If your looking for a quick way to get across the sea. This is not it, their slow and stamina runs out fast. Believe it or not their very vunerable and other megs will still attack. Their turning radius isn't great either. Your better off with a Sarco.
1. Get an ichthy with a saddle
2. Find a megalodon underwater
3. Kite the megalodon to shallow water with your ichthy
4. Tranquilize it from the shore or a rock safely
5. Make sure you don't keep shooting it after it is KO (I learned this the hard way)
6. Name it Bruce