Times (UK): A team of engineers using an underwater robot was struggling last night to control one of the world’s most challenging oil spills after an explosion ripped apart and sank a rig leased by BP in the Gulf of Mexico. As fears grew for the safety of 11 workers still missing, BP and US officials were tackling what could be a major pollution incident using booms and dispersant chemicals. The spill is being fed by an estimated 13,000 gallons of oil and gas that were pumping every hour …