They had so much rubble to clear, he says, that they often keeled over in the heat under the weight of their protective gear. Taken out in ambulances, they would usually be back the following day.

In order to raise the efficiency of planetary gear system, the main factors concerned with the efficiency should be found out.

The failing light was such that observation by periscope could not be relied on, and the Upholder's listening gear was out of order.