Anton, keenly at attention, answered,
"What shall I send?"
"The S.O.S., first. Then the code signal for the Revenue Cutter Bear—you know it, don't you?"
"Yes."
"Then send—'Americans in peril, Chukalook' and give the latitude and longitude. You'll find that written down just inside the cover of the International Code Book. I put it there in case of need. Repeat the S.O.S., the code number and the message until you get a reply."
"And if I don't get a reply?"
"Keep on sending."
"Until when?"
"Until you're shot down, if necessary!"