[spaghetti]

I second what the other mates said.
If strong current is an issue, try to the following trick:
before starting your dive, throw a piece of wood in the sea and watch where it goes to. That will tell you the main direction of the current. When ready, start your swimming against the current, so that you will be in favour of current when you'll finally have to swim back to shore.
The reason for doing this: It's better to swim against current at the beginning, when you're still fresh, than at the end, when you'll be tired and less motivated.
Of course the direction of the current might suddenly change within 4 hours, but that's facts of life.