"Well since we have protection for land such as land mines, spikes bear traps etc. We have SAM sites for balloons. I made a concept for what should be a Naval Mine designed to protect the waters from unwanted sailors, boaters and raiders.

It would be craftable by using 100 gunpowder, 1 empty propane tank, 1 rope and 50 metal fragments and could be bought from the Bandit Camp."