The pressure wave generated by the colossal third explosion radiated out from Krakatoa at . The eruption is estimated to have reached 310 dB, loud enough to be heard away.: It was so powerful that it ruptured the eardrums of sailors away on ships in the Sunda Strait,: and caused a spike of more than in pressure gauges away, attached to gasometers in the Batavia gasworks, sending them off the scale.