high_tunnel.lua

print("how high")
y = tonumber(read())


print("how long")
z = tonumber(read())

Y = 1

Z = 0

while Z <= z do
    turtle.dig()
    turtle.forward()
    while Y <= y do
        turtle.turnLeft()
        turtle.dig()
        turtle.turnRight()
        turtle.turnRight()
        turtle.dig()
        turtle.turnLeft()
        if Y ~= y-1 then
            turtle.digUp()
            turtle.up()
        end
        Y = Y+1
    end
    while Y ~= 1 do
        turtle.down()
        Y = Y-1
    end
    Z = Z+1
end