Earth Tunnelling, Air Tunnelling

Earth tunnelling makes me hot and bothered. But, boy, do I enjoy air tunnelling!

In a foreword to a book on the Yum Kippur war, an Israeli general remarked that future battle grounds are getting more and more "congested."

That kind of situation does call for air tunnelling. Tunnelling where there is noting to tunnel, nothing to dig, noting to shovel ... cool ...