This is a hint which makes Mission 12 a little bit easier. Personally I find it good because battling the gang members on the deck can be a bit frustrating especially when you're doing fine but Yasmin manages to get herself killed. Near the Sol Vita's gang plank (where you get onto the deck of the ship) is a large dock crane. It is attached to a platform containing some orange coloured oil drums and some boxes ready to be loaded onto the ship. At the back there is a gap where you can walk onto the platform. Once you do so the cargo is loaded onto the ship with you on it. This means you don't have to have a shoot-out with all those gang members on deck, which can be a bit frustrating at times.
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You can't miss spotting the crane!
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Walk onto the platform where the gap is.
NOTE: If the movie doesn't start walk further onto the platform. You can be standing on it without triggering the movie if you aren't close enough to the centre.
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A FMV sequence will begin showing the crane loading the goods onto the ship (with you on it).
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You will be put down here, bypassing most of the gang members on the deck.