These are the most frequently used words in another edition of this book.
affect
air
allow
amount
animals
area
ascent
avoid
bc
boat
body
bottom
breathe
breathing
buddy
buoyancy
called
cause
changes
conditions
current
cylinder
decompression
depth
dive
divers
diving
dry
during
ear
effect
end
environment
equipment
feet
figure
fins
first
gas
get
good
group
hand
heat
help
hose
increases
inside
keep
learn
light
lungs
mask
may
meters
minutes
move
must
need
nitrogen
open
place
plan
position
pressure
problems
provide
rate
reduce
regulator
remove
repetitive
scuba
second
see
should
skin
snorkel
stage
stop
suit
surface
system
table
take
tank
temperature
time
training
two
types
underwater
use
valve
volume
water
waves
weight
without
yourself