Why do you want to ship it by sea? It's not because of the recent spate of air accidents is it? The chances of your miner going missing due to some aircraft malfunction is much, much lower than the chances of it being lost at sea. I've seen what happens to shipping containers when the seas are rough and it ain't pretty.
did you know that antminer will cost 280 $ and the cost of shipping 10 Kg will cost me 420$ and what you think if the shipping
cost more than one antminer
You will need to find the cheapest shipping option available (which may be by sea, as you said) and decide whether the savings are worth the money you will miss out on while waiting for the hardware to arrive. If one option earns you more money than the other, then go with that one. Also, perhaps you need to reevaluate your decision on buying the Antminer device. It may not be financially feasible for you to invest in, given the cost or time of shipping to your current location.
Just make sure you have your parcel covered and even if it gets lost you will get your refund, i don't see an problem here at all?