Act IV: The masts snap and the rudder goes missing. There is panic. Lives are already being lost, but it is not known how many. Cannons and casks are careering randomly about, making it impossible to guess who'll be alive and who dead ten seconds from now. The compass, barometer, et cetera, are all destroyed and the records of their readings swept overboard – maps dissolve – sailors are helpless – those who are still alive and sentient can think of nothing to do but pray.