Location: School of Fish
Depth: 379

Solution to Back and Forth

by halftime

Answer: COLORED ICE

The answers to the clues are:

CO
rOCkmeLOn
sOLitaiRE
vERDI
guIDanCE
EC

Each answer (except the two two-letter answers) contains two bigrams that can be found, reversed, in other answers (specifically, the two adjacent answers in the list). This creates a chain of answers, with the two two-letter answers at the endpoints. Read the bigrams in the proper direction to extract the final answer, COLORED ICE.