Letters from Iwo Jima

In 2005, Japanese archaeologists explore tunnels on Iwo Jima, where they find something in the dirt. In 1944 Iwo Jima, Private First Class Saigo, a conscripted baker who misses his wife and newly-born daughter, is digging beach trenches with his platoon when Lieutenant General Tadamichi Kuribayashi arrives to take command of the garrison. He saves Saigo from a beating by Captain Tanida for being "unpatriotic", and orders the garrison to tunnel underground defenses throughout the island.