No, blowing up the ship is only a viable option if you agree to meet the board of directors of the company that ordered its seizure aboard the ship for negotiations. Once they're all aboard, *then* blow it sky high.
Seizing navy ships has a way of seeming like a poor idea.
I don't know much about their military capabilities but sending a couple ships off the Ghana coast in international waters to let people know you take the issue seriously seems like a good start. A tersely worded message with a warship patrolling offshore seems like a more effective way of getting a ship back than a message alone.
If that doesn't work a message saying some version of "That ship is ours and we're sending a ship with some marines to secure the vessel and take it back. We'll be arriving on X day at Y time if we don't get it back by then." No way does Ghana start a war over this and shoot at them when they arrive to take the ship back.
I reread my last and noticed I forgot to say these aren't what I suggest doing but rather options that came to my head in the middle ground between war and going through the court system to get it back (or simply paying what you owe).
Originally Posted by Kuzco
Do you know of similar cases? How where they resolved?
http://en.wikipedia.org/wiki/Hainan_Island_incident - Chinese fighter had a mid air collision with a USA intelligence aircraft which made emergency landings. They kept it for 3 months and gave it back, probably after copying all the equipment they could and analyzing everything.