Ships and how to get them

I think there should be a time crystal that contains magic power that can turn back time that so when you place it on a structure it shows what it was like in the past. this would be useful for shipwrecks under the sea. once you place the time crystal on the shipwreck, VOILA, it turns back into the actual ship it was in the past before it got damaged and sunk to the bottom of the sea. Maybe when it turns back into the ship from the past pirates or other people (like merchants or fisherman) will appear on it. so, if you get pirates you will have to fight them off to claim ship for yourself. I think we should have ships so you can carry lots of cargo and transport lots of animals or many people to different places. maybe a couple cannons could appear on the ship if pirates appear too.