Singaporeans at the May Day Protest Rally at Hong Lim Park.(This banner is available for advertisements at $30 per day)
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Look at the picture carefully. Look at how the steel plates folded, outwards and upwards. It looks like the explosion was from inside or from below. An internal accidental, hitting a mine below?
If it was hit by a torpedo, the steel plates would be folding outwards from one side. You make your conclusion.