abyss 
/əˈbɪs/ noun
plural abyss·es /əˈbɪs/ noun [count] : a hole so deep or a space so great that it cannot be measured
▪ the ocean's abysses ▪ I stood at the edge of the cliff and gazed down into the yawning/gaping abyss. [=chasm] — often used figuratively ▪ He says that there is a widening abyss between the rich and the poor. ▪ She was pulled down into an abyss of despair.
▪ the ocean's abysses ▪ I stood at the edge of the cliff and gazed down into the yawning/gaping abyss. [=chasm] — often used figuratively ▪ He says that there is a widening abyss between the rich and the poor. ▪ She was pulled down into an abyss of despair.
