First Stimson briefed us on the geography of our objective. Yat was a volcanic island, one of a group strung across the shallow sea east of Borneo and north of Celebese. It was almost circular, with a diameter of about seven miles, and was entirely covered by a dense tropical forest. The principal feature of the island was an extinct volcanic crater, rising to an altitude of 2,000 feet, at the east end of the island. The crater measured about two miles across, and perhaps a third of its area was filled with water from a narrow channel leading to the sea. Photos taken before the closure of Yat by the Indonesians showed a typical Malay isle: cocoanut and mango plantations, with forests of gum and mahogany climbing and filling most of the crater. The entrance channel was narrow and quite deep and the interior lake constituted an ideally sheltered anchorage. On the east coast the land rose steeply in a series of mossy cliffs over which waterfalls poured, while to the west, away from the volcano, plantations stretched inland from the coral beaches. As we studied the pictures and charts, Stimson briefed us on the course of action. "Your first objective is to find out what they're doing in that crater. Are they building some new weapon, or training an army, or what. You'll have Geiger counters and a krypton analyser of course, although the analyser is no guarantee in detecting fissionable material production. Then we want to know what their plans are, particularly in the next few days or weeks. Finally, just who is involved in it? Is New Buddhism entirely Asiatic, as they claim, or has Russia cut herself in too?" "You will be landed on the west coast of the island just after sunset. The east, with its cliff and entrance channel is undoubtedly too well guarded, but on the west side, with four miles of flat country, they may depend on defense in depth, so that you'll have a better chance of getting past the beach. The plane will come in low, make a landing just off the breakers and drop you off in rubber swim suits. It will then taxi to the north of the island and make a fairly long stop, to divert attention, since it will certainly be picked up by radar. Your job will be to swim ashore, bury the rubber suits, and make your way east to the crater. If you reach the rim, see what you can, and report by radio at any hour. If you don't make it to the top, observe as much as possible on the island, make your reports, and rendezvous with the plane at your landing point at 2400 the next day. If you miss that time, a plane will be back daily at the same time for four days. After that, we will assume that you have been caught."