Single light low on the horizon during the day, disappeared into the ocean came back out continued on. Thinking that it was very low for a plane to be flying, I witnessed a light low flying straight for miles headed south. I wouldn’t have seen it if there was not rain actively on the horizon giving it a great backdrop. But when it moved to the left and then the right and then drove straight down into the ocean I knew that I did not see a plane flying. It came back up out of the ocean and continued on its low path. When I saw it deep down it was two cities away and the light did not lose its intensity or size.