“Goodwin, during the next two hours we tried every way in our power to force entrance through the slab. The rock resisted our drills. We tried explosions at the base with charges covered by rock. They made not the slightest impression on the surface, expending their force, of course, upon the slighter resistance of their coverings.

“Afternoon found us hopeless. Night was coming on and we would have to decide our course of action. I wanted to go to Ponape for help. But Edith objected that this would take hours and after we had reached there it would be impossible to persuade our men to return with us that night, if at all. What then was left? Clearly only one of two choices: to go back to our camp, wait for our men, and on their return try to persuade them to go with us to Nan-Tauach. But this would mean the abandonment of Thora for at least two days. We could not do it; it would have been too cowardly.

“The other choice was to wait where we were for night to come; to wait for the rock to open as it had the night before, and to make a sortie through it for Thora before it could close again.