Talk:Mobile Vehicle Bay/@comment-25952772-20160619100852

The MVB won't actually allow you to build either of the submarines unless you already have the blueprints (from scanning the required number of fragments, which are found in/near wrecks). You also have to have the ingredients for the blueprint in your inventory, everything in the list will be green (if its red, it means you are missing that item).

The MVB won't allow you to access the build menu unless you have mounted it (by using the 'Climb' command) and your head is out of water - so you can use the MVB on the surface, or in a Moonpool, or in a cave that has an air pocket in it (if you find one).

You can pick up the MVB and redeploy it, just like you do the beacons. The hot spot to 'Pick Up Mobile Vehicle Bay' is just to the left or right of the 'Climb' command, and can be tricky to line up when there are waves bouncing you up and down. You can also turn the MVB, so that submarines you build fall into deeper water, by swimming next to it and just nudging one of the four feet of the MVB. It doesn't take much force to spin it, so be sure its facing the way you want BEFORE you start building a submarine.

Remember that any submarine you build will be constructed in the air, then fall into the water - if the water is too shallow (rocks, coral, whatever) then your sub will be damaged or stranded. Also, don't be an idiot and swim over under your new submarine while they are building it. Its a great view, and a cool photo, but when the sub drops you are going to be very sad - especially if you are between the sub and a rock...