Andreas Thurnherr : it may surprise that much still unknown about oil 's flow in deep water . The oil can be measured , he says , but vagaries of dispersal at depths require research . Thurnherr : Data collection must begin when spill is detected to gauge environmental impact .
Andreas Thurnherr says it may surprise that much still unknown about spill 's flow in deep sea . Surface oil can be measured , he says , but vagaries of dispersal at depths thwart technology . Thurnherr : Data collection must continue when spill is done to gauge environmental impact .