Post-war Analysis of The Sinking
Post-war analysis by the U.S. Naval Technical Mission to Japan claimed that Shinano had serious design flaws. Specifically, the joint between the anti-projectile armor on the hull and the anti-torpedo bulge on the underwater body was poorly designed; Archer-Fish's torpedoes all exploded along this joint. Also, the force of the torpedo explosions dislodged an H-beam in one of the boiler rooms. The dislodged beam turned into a giant battering ram that punched a hole between two of the boiler rooms. In addition, the failure to test for watertightness played a role. Survivors claimed that they were unable to control the flooding because the water poured in too fast; some claimed to have seen rivets between seams burst and allow water to surge through. The executive officer blamed the large amount of water that entered the ship so soon after the last hit on the failure to air-test the compartments. Additionally, the ship's list to starboard caused the pumping valves to rise above sea level, which would have made it impossible to counter-flood and right the ship even if they had worked properly.
Read more about this topic: Japanese Aircraft Carrier Shinano
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