3 ms·
If you know the exact direction at the opening and, the tunnel is in a straight line a laser pointer should work fine. Just keep making sure it hits where you
by dsmithatx 11y ago
If you know the exact direction at the opening and, the tunnel is in a straight line a laser pointer should work fine. Just keep making sure it hits where you are digging. Reading the entire story it sounds like that is all they were doing.