1883, Forth, C. , The Surprise of the Channel Tunnel 

C. Forth (1883) The Surprise of the Channel Tunnel

Little information about this other than a brief entry in Norman Longmate’s (1991) Island Fortress: The Defence of Great Britian 1606-1945:

1883, saw the publication of C. Forth’s The Surprise of the Channel Tunnel, the normal work of imaginative fiction, notable only for its ending. After the invader has finally been driven out an Act is passed making it high treason even to propose building a tunnel again.

Map of proposed Channel Tunnel 1880