The sun sets Jan. 5 behind the giant floating crane that is being used to repair the south jetty at the entrance to Mission Bay. The crane is picking up and moving boulders as well as adding new ones. The project should be completed later this month. The U.S. Army Corps of Engineers Los Angeles District is overseeing the repairs to the outer 250 feet of the middle jetty at Mission Bay. In this photo the crane is at the end of the south jetty at the mouth of Mission Bay. This is a high dynamic range photo that is composed of three photos of the same subject but using different exposures (lighter and darker shots), and added together in the computer. This technology was orginally developed in the forties and fifties to take pictures of nuclear bomb blasts as the wide range of light values is impossible to capture with a single camera exposure.