To those who were wondering about the four new attachments to the ship, aka the Shark Hunting Spears, you will need to get a blueprint from bronze sealed chests. The obtaining minimum is set at a base level of 100. As explained on the developer forum, they scale based on a certain stat that you may or may have not invested. For example, which I recently obtained, the Throwing Harpoons scaling off of Strength.
Presumably, you have infinite ammunition when using these attachments, thus will allow you to continue trying to hunt down sharks as they surround your ship. Think of it as a “summoning ring.”
Unfortunately, since the sharks are very buggy, when you land one hit, they will hit your ship and then go back underwater. This will need to be patched some time soon.
