ABC

A: Abyss
B: Bottom
C: Core
D: Depth
E: Echo sounder
F: Fill
G: Ground
H: Height
I: Inner
J: Journal
K: Krab
L: Louisiana
M: Mermaid
N: Nautilus
O: Off shore
P: Pacific Ocean
Q: Quantity
R: Rhombus
S: Submarine
T: Top
U: Underwater
V: Verne
W: Well
Z: Zenith