COLLEEN's brother, 17, male, brave undersea explorer and introverted high schooler.

PARKER's sister, 17, female, hard-ass. She walks with arm braces due to an accident in junior high.

New girl in school, 17, female, demure, a little shy, good student.

Classmate, 17, F/M, the alpha-dog, doesn’t work well with others.

Classmate, 17, M/F, friend of JESSIE’s, not the brightest bulb.

Research scientist, Male, 30s, submersible engineer, perpetually grumpy.

Research scientist, Female, late 20s, marine anthropologist, cheerful and optimistic.

School Counselor, adult, M/F, over-enthusiastic.

School principal, adult, M/F, brusque, direct.

English Teacher, Adult, M/F, gentle, passionate, empathetic

Social services, adult, M/F, all business, no fun.