Is it the outer core or inner core?

a)Summary Plot Overview

It is just before dawn, and not far off the coast of Florida, between the open sea and the surf, are four men in a dinghy. The ship on which they were sailing sank overnight, and they are the only survivors, left to bob up and down in the waves until their bathtub-sized boat capsizes and they too drown. They do not have a moment’s peace. The ocean is so rough that one indelicate move will upset the dinghy and send them into the winter waters. Each man, despite not having slept for two days, works tirelessly to keep the boat afloat. The correspondent and the oiler share the work of rowing, while the cook huddles on the floor of the dinghy, bailing water. These men take their direction from the captain, who was injured during the shipwreck and sits grimly in the bow, the memory still fresh of his ship engulfed in the sea and the crew’s dead faces in the water.