RC's airlock internal

-- This is an airlock door system, designed for RaspberryCommie's underwater base. Really really basic.

local pullEvent = os.pullEvent
os.pullEvent = os.pullEventRaw
while true do
term.clear()
term.setCursorPos(1, 1)
print("This airlock leads to the outside.")
term.setCursorPos(1, 2)
print("Please ensure you have adequate underwater gear.")
term.setCursorPos(1, 3)
print("Type open to begin airlock procedure. You will have 5 seconds to exit.")
input = read()
if input == "open" then
    term.clear()
    term.setCursorPos(1, 1)
    print("Airlock opening.")
    redstone.setBundledOutput("bottom", 6)      -- Closes internal door, opens external doors
    sleep(5)
    redstone.setBundledOutput("bottom", 2)      -- Closes external door, keeps internal closed
    sleep(5)
    redstone.setBundledOutput("bottom", 0)      -- Opens internal door
end
if input == "debug" then
    term.clear()
    term.setCursorPos(1, 1)
    print("Debug mode activated. Use CTRL + T after 5 seconds to exit program.")
    sleep(5)
    os.pullEvent = pullEvent
end
if input ~= "open" and input ~= "debug" then
    term.clear()
    term.setCursorPos(1, 1)
    print("Incorrect command.")
    sleep(3)
end
end