Where to find diamond ore in the new tutorial world in minecraft?

Does anyone know where to find diamond ore in the new tutorial world in minecraft?

Added (1). I found the block of diamond in stampys house and 3 diamond ore in the stronghold BUT I NEED more to repair my pickaxe and armour

Added (2). I found some at x=-255 y=15 z-18 ITS IN THE MIDDLE OF A BODY OF WATER THERE's THREE ORE AND ANOTHER THREE SOMEWHERE ELSE IN THAT CAVE

Underground try strip mining in really low layers