 The subterranean passages under the Rock provided the sole available office space , and in them was located the signal equipment by which we expected to keep in touch with the commanders of the three assault forces . The eternal darkness of the tunnels was here and there partially pierced by feeble electric bulbs . Damp , cold air in block @-@ long passages was heavy with stagnation and did not noticeably respond to the clattering efforts of electric fans . Through the arched ceilings came a constant drip , drip , drip of surface water that faithfully but drearily ticked off the seconds of the interminable , almost unendurable , wait which always occurs between completion of a military plan and the moment action begins . 
 The subterranean passages under the Rock provided the sole available office space , and in them was located the signal equipment by which we expected to keep in touch with the commanders of the three assault forces . The eternal darkness of the tunnels was here and <a href='dey_it' title='1'><mark>there</mark></a> partially pierced by feeble electric bulbs . Damp , cold air in block @-@ long passages was heavy with stagnation and did not noticeably respond to the clattering efforts of electric fans . Through the arched ceilings came a constant drip , drip , drip of surface water <a href='null_relcl' title='2'><mark>that</mark></a>faithfully but drearily ticked off the seconds of the interminable , almost unendurable , wait which always <a href='uninflect' title='3'><mark>occurs</mark></a> between completion of a military plan and the moment action <a href='uninflect' title='4'><mark>begins</mark></a> . 
Da subterranean passages under tdaRock provided the sole available office space , and in em was located the signal equipment by which we expected to keep in touch w thdaommanders of thedaree assault forces . The eternal darkness of the danels was here and it partially pierced by feeble electric bulbs . Damp , cold air in block @-@ long passages was heavy witwagnation and did not noticeably respond to the clattering efforts of electric fans . thru the adaed ceilings came a constant drip , drip , drip of surface water faithfully but drearily ticked off the secs of the indaminable , almost unendurable , wait which always occur between completion of a military plan and the moment action begin .