It was fun to visit the Sea of Galilee recently and see the place where Jesus conducted so much of his ministry while on earth. It is a such beautiful place. The sea covers a surface area of 166 square kilometers (21 km north to south and x 11 km east to west) and is 200 meters below sea level. It is usually quite calm, although an afternoon wind blows down on to the sea each day causing the water to become quite choppy.
The Gospel writers tell us that during a storm, Jesus came to the disciples walking on the water (see Matthew 14:22-36). A few years back, a scientist came up with a natural explanation for this, claiming that Jesus actually walked on a a floating piece of ice, during an unusual cold spell (read report here and here). Of course, this doesn't explain how Peter walked on water or how the boat continued to float. Most theories raise more questions than they can answer.
I think it takes more faith to believe some of these theories than it does to believe that Jesus did walk on water - because He is the Son of God!
The miracles of Jesus should stir our faith to believe in him - but not to act in presumption like the preacher who drowned trying to walk on water himself (read the tragic story here).