Superman is completely invulnerable to anything that doesn't involve Kryptonite.
This includes guns, explosions and water.
So we're not entirely sure why Clark is floating in the water in this opening sequence, doing his best impression of
s James Bond doing an impression of Jesus.
Perhaps in this version of the mythology, it takes longer for Supes to develop his powers, which would actually be a smart move.
One of the biggest criticisms of the character is that, because he's essentially invincible, there's no tension.
The comics get around that by putting his pals into peril, but here it seems that Superman will be facing some personal pain.
This is backed up by the shot later on in the trailer of our hero being knocked to the ground, apparently in a weakened state.
Let's hope Snyder and Nolan don't push that element too far, though.
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