1.   Monterey Bay in northern California is an underwater canyon about the size and depth of the Grand Canyon.

2.   And sometimes by accident, the biologists fatally wound the animals while removing them from hard-to-reach places in the underwater canyon.

3.   Beneath the picturesque Monterey Bay is an underwater canyon more than two miles deep with steep rocky precipices.

4.   He discovered deep underwater canyons where the Danube and Dnieper rivers had once cut deep to reach the declining waters of the preflood Black Sea.

5.   Or the time the sub nearly became trapped in an underwater canyon.

6.   During the Cold War, U.S. and Russian submarines stalked one another deep in the underwater canyons of the Atlantic Ocean.