a·byss·al

[uh-bis-uhl]
adjective
1.
of or like an abyss; immeasurable; unfathomable.
2.
of or pertaining to the biogeographic zone of the ocean bottom between the bathyal and hadal zones: from depths of approximately 13,000 to 21,000 feet (4000 to 6500 meters).

Origin:
1685–95; < Medieval Latin abyssālis. See abyss, -al1

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World English Dictionary
abyssal (əˈbɪsəl) [Click for IPA pronunciation guide]
 
adj
1.  of or belonging to the ocean depths, esp below 2000 metres (6500 feet): abyssal zone
2.  geology another word for plutonic

Collins English Dictionary - Complete & Unabridged 10th Edition
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Abyssal is an SAT word you need to know.
So is coerce. Does it mean:
surrender under agreed conditions
to compel by force, intimidation, or authority, esp. without regard for individual desire or volition:
Etymonline
Word Origin & History

abyssal
1690s, used especially of the zone of ocean water below 300 fathoms, from abyss.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
abyssal   (ə-bĭs'əl)  Pronunciation Key 
  1. Relating to the greatest depths of the oceans and to the organisms that live there. The abyssal zone encompasses all depths below 4,000 m (13,120 ft).

  2. Relating to the region of the ocean bottom between the bathyal and hadal zones, from depths of approximately 2,000 to 6,000 m (6,560 to 19,680 ft). The abyssal zone includes nearly two-thirds of the Earth's surface.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The abyssal depths had always been regarded as a desert, incapable of
  supporting life.
There is a census of coastal waters and a census of the abyssal plains, a
  census of coral reefs and a census of seamounts.
From the abyssal depths to the tropical shallows, the ocean teems with myriad
  creatures.
Submersibles alone enable us to explore the abyssal depths.
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