一艘船如何抵御海洋生物，并可能赢得胜利？

I have a Viking-inspired race living on a harsh ocean based planet with very rough and cold seas. In these seas there are giant creatures, not unlike kraken who frequently attack ships. I was thinking long and hard without an answer on how a ship (e.g. Viking longship ) could possibly defend itself against one of these creatures, and win or at least drive it away. It is also important to note that a kraken would be 3-4 times the length of the ship.I have a Viking-inspired race living on a harsh