BranchMining

os.loadAPI("MineAPI")

local isDown = true
local mainWidth = 3
local mainHeight = 3
local mainDept = 20
local branchDept = 5
local branchHeight = 2
local mainWidth = 2

function tunnel()
	for i = 0, mainDept - 1 do
		MineAPI.forward()
		if i%2==0 then
			turtle.turnRight()
		else
			turtle.turnLeft()
		end
		for y = 0, mainWidth - 1 do
			if mainHeight == 2 then
				MineAPI.digDown()
			elseif mainHeight == 3 then
				MineAPI.digDown()
				MineAPI.digUp()
			else
				if y%2==0 then
					MineAPI.digDown()
				else
					MineAPI.digUp()
				end

				for z = 0, mainHeight - 4 do
					if y%2==0 then
						MineAPI.moveUp()
					else
						MineAPI.moveDown()
					end
				end

				if y%2==1 then
					MineAPI.digDown()
				else
					MineAPI.digUp()
				end
			end

			if y ~= mainWidth - 1 then
				MineAPI.forward()
			end
		end
		if i%2==1 then
			turtle.turnRight()
		else
			turtle.turnLeft()
		end
	end
end

MineAPI.moveUp()
tunnel()