Crawl into ship
When online, go to the docks. You can get into the ship. When you are on the ship, get as far as you can to the right beside the ramp. Go to the second line on the ship, then zoom in and very slowly turn to the right. You will start lifting up into the air. When you are as far as you can get, look at the ramp and start crawling to it. If done correctly, you should be able to crawl into the ship. Once there you can shoot out, but opponents cannot shoot in.