梅丽尔·斯特里普

Meryl Streep

饰：Narrator

Dr. Judith Connor

饰：Herself (Monterey)

Dr. William Hamner

饰：Himself (Palau)

Rainos M. Hayes

饰：Himself (Hawaii)

Steve Kitana

饰：Himself (Maine)

Richard Marsh

饰：Himself (Hawaii)

Laura Martin

饰：Herself (Palau researcher)

Stephanie K. Martin

饰：Herself (Maine)

James A.R. McFarlane

饰：Himself (Monterey)

Jennifer Rock

饰：Herself (Maine)

Marty Thomas

饰：Himself (Hawaii)

Francis Toribiong

饰：Himself (Palau native)

Bruce Robison

饰：Himself (deep ocean research, Monterey) (as Dr. Bruce H. Robison

Judith Connor

饰：Herself

William Hamner

饰：Himself

Steven K. Katona

饰：Himself

梅丽尔·斯特里普

Meryl Streep

饰：自己