There was, however, a big secondary explosion that sank the liner within minutes of the torpedo strike.

That fireball blows the tank commander out of that tank; the secondary explosion blows the turret off that tank.

A secondary explosion was reported approximately four hours later, with 20 rescue workers now among those missing.

Two solid explosions were heard, including an internal secondary explosion.

Once sighted the main battery commenced firing, and one salvo found its mark, causing a large secondary explosion which sank the kaiten.