Efforts to plug the leak with concrete failed Saturday . Officials will try again Sunday and use polymer instead . Water testing has been ordered further south and offshore . Comment: Crews have dispersed about 2,000 liters ( more than 500 gallons ) of synthetic resin in a 500-square-meter locale , according to Tokyo Electric . The oil is in a layer of mud that's about 100 feet thick, so it can be seen from space.
Efforts to plug the leak with concrete failed Saturday . Officials will try again Sunday and use polymer instead . Water testing has been ordered further south and offshore . Comment: The oil is in a layer of mud that's about 100 feet thick, so it can be seen from space.