I REPEAT: THE TIDE COMES BACK IN. Why am I mentioning this, you may ask? If you have ever been to Bar Harbor, ask a local about what happens on the sand bar each year. At low tide, people often drive their cars out onto the sand bar to observe the surrounding nature, or to visit Bar Island across the way. Sounds picturesque, right? It is until you forget that the tide comes back in, and your car is now under water. 14-foot tides are not rare in Maine.