Tunnel at Blue Lagoon in the Rabaul's outer harbor

P1000150 Tunnel at Blue lagoon

One of the many tunnels Japanese defenders dug in the soft rock of cliff faces around Rabaul for protection for themselves and their equipment from extraordinarily heavy bombing by Allied forces. These large and small tunnels meant 100,000 well armed Japanese were ready to defend "Fortress Rabaul" if the Allies invaded. Fortunately, they did not -- even though their (faulty) intelligence assumed that only 50,000 defenders, poorly equipped, probably starving, remained. Despite the softness of the rock (or perhaps because of it) and the frequency of earthquakes due to the volcanic nature of the area, the tunnels survive today 70 years on. P1000150

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