>You can't possibly have 10 helis safely unloading cargo at once from a single ship
5 loading at a time, while the other 5 unloading on the ground - plenty of space as ship is 1300 feet long.
> doing that in the dark would simply not work
you flood the ship and the space around with light. Almost 30 years ago we did a night ship unload at an unprepared location - no issues.
>10 sorties/hour is also unrealistic
doing it with crane we did about 15+ - we weren't union operation though - we were paid for performance, not time :) and being young we were moving fast. With chopper not much different if weather is ok.
IMHO if helis would even work (which is debatable and debated here), the optimistic estimate is that you could unload something like 20 containers per hour, 300 containers per day, so 30 days for the cargo. It seems plausible that you can dredge the banks and drag the ship out much quicker than that.