1920, George M. Battey, Jr.,70, 000 Miles on a Submarine Destroyer[1], Webb & Vary Company, page133:
It is not known just what action will be taken against the captain of theundersea boat.
1923,The Saturday Evening Post[2], G. Graham, page58:
"You're right!" she cried. "I'm sure you are." Twenty reasons come back. Anundersea tunnel to the little island.
1966, Robert B. Thomas,The Old Farmer's Almanc[3], Yankee Pub, page44:
The Sediment (SNAP-7E) Density Meter (an underwater rocket) has been developed to investigate to an ocean-bottom depth of 11 sedimentary feet. Sea Lab I, the Navy’s newundersea laboratory, complete with observation porch and garage, should become safe to operate at the 200 foot level.
2022 December 28, “The essential Eurotunnel”, inRAIL, number973, page59:
The Channel Tunnel is the longestundersea tunnel in the world, with this section being 38km (23.6 miles) long.
