Hi all, I looking for a book which was probably published in the 1970s. The plot was that a 20th century submarine (US?) suffers an accident and is lost with all hands. The crew wake up some time in the future to find that they have been an exhibit in a museum (this part may be incorrect) but they do wake up in the future. They have been woken up in order to fight a war against invaders. If I remember correctly the invaders are underground and one of the things the submarine crew comes up with a depth-charge like devices which can sink through the ground.
Any ideas?
Lee
Any ideas?
Lee