Board Thread:Suggestions/@comment-25411747-20140726014128

Intro
Yes, I realize that this idea may be a bit OP. The idea behind this is to better defend islands and such from invading forces. Currently, it's a bit too easy to invade someone. Just drive a boat up and jump off. Way too easy. (Unless they snipe you, which can be countered by armor.)

The recipe will be simple but the requirements high.

The Mine Itself
The Sea Mines purpose will be to blow up anything that touches it. A single Mine can blow up a Catamaran or severely damage it depending on where it hits. They can only be placed in non-drinkable water and can only be detonated by boats.

Recipe: Plank + Gunpowder + Refined Iron

Skill Requirements: Crafting 8, Engineering 8, Shipbuilding 5 and Chemistry 7

Types
There are four types of Mines: the Floating Mine, the Anchored Mine, the Linked Mine, and the Anchored Link Mine

Floating Mine
The Floating Mine is simply that: a floating mine. Put on of these down and it will float until some idiot hits it with a ship. Not recommended for defense.

Anchored Mine
A better version of the Floating Mine. This mine floats around, but only in a certain area. It is crafted by simply adding 2 Rope and a Small Stone at the end of the recipe. You also need a Masonry skill of 6 to craft this.

Linked Mine
This mine is like the Floating Mine, but with three of them linked together. It is designed for taking down Merchant Frigates and War Sloops. The only downside is that they float around.

Anchored Linked Mine
This mine is the best for defense. It is the recipe for the AM combined with the LM recipe. The mine is anchored down by the middle one and floats around in a certain radius. You also need a Masonry skill of 6 to craft this

Conclusion
Basically, the purpose of the mine is to boost defence to tribes near the shore or on small islands. 