What dangers from the outside alarm the secret Annexe folks from july to december , 1943 ?

The outside alarm?

The outside alarm was exactly that, "alarming." Life inside the annex would come to a halt......... people became frightened, and escape was a foremost thought in their minds. Escape would also mean discovery, therefore the outside alarms were like a double edged sword.

"The first warning siren went off in the morning while we were at breakfast, but we paid no attention, because it only meant that the planes were crossing the coast. I had a terrible headache, so I lay down for an hour after breakfast and then went to the office at about two. At two-thirty Margot had finished her office work and was just gathering her things together when the sirens began wailing again. So she and I trooped back upstairs. None too soon, it seems, for less than five minutes later the guns were booming so loudly that we went and stood in the passage. The house shook and the bombs kept falling. I was clutching my 'escape bag', more because I wanted to have something to hold on to than because I wanted to run away. I know we can't leave here, but if we had to, being seen on the streets would be just as dangerous as getting caught in an air raid. After half an hour the drone of engines faded and the house began to hum with activity again. Peter emerged from his lookout post in the front attic, Dussel remained in the front office, Mrs van D. felt safest in the private office, Mr van Daan had been watching from the loft, and those of us on the landing spread out to watch the columns of smoke rising from the harbour. Before long the smell of fire was everywhere, and outside it looked as if the city were enveloped in a thick fog."