1.
– a vessel that travels underwater
2.
– an underground train system
3.
– to go or put something under water
4.
– a person or thing that takes the place of another
5.
– the process of taking one number away from another
6.
– below the usual or expected quality
7.
– to divide into smaller parts
8.
– a smaller title within a section of writing
9.
– the layer of soil beneath the topsoil
10.
– below zero temperature
11.
– a smaller group within a larger culture
12.
– the part of the mind not fully aware
13.
– willing to obey or yield to others
14.
– existing or occurring underground
15.
– money given by a government to support something
16.
– not obvious; delicate or slight
17.
– to become less intense or calm down
18.
– to sink below the surface (note: appears twice intentionally for reinforcement or can be swapped if preferred)
19.
– willing to serve others in a lower role
20.
– a smaller part of a section
