The undersea reaches lay ahead of him, and the way was clear.
The trees were oddly like undersea growths, which puzzled me for an instant.
These seem to have been used, at least, to operate doors of undersea crafts.
Undersea, submarine; underspan, subtend; underslinking, subterfuge.
Fields of undersea, the lines faint brown in grass, buried cities.
This machine will nicely furnish you the power for your undersea liner.
By the time he was at that spot nothing was to be seen of the undersea boat.
But he was certain: for a moment he had heard the twitter of undersea communicators.
All went well with Johnny on his undersea photographing trip until he had reached the fifteen-hundred-foot level.
The death in that undersea channel was deliberate and unhurried, and the imagination had free play.