- Michael C. Barnette
- Â Self - Marine Biologist and Explorer 18 episodes, 2022-2024
- David O'Keefe
- Â Self - Military Historian 18 episodes, 2022-2024
- Jimmy Gadomski
- Â Self - Wreck Specialist / ... 18 episodes, 2022-2024
- Rushmore DeNooyer
- Â Self - Narrator 18 episodes, 2022-2024
- Wayne Abbott
- Â Self - Historical Investigator 15 episodes, 2022-2024
- Jason O. Harris
- Â Self - Lt. Col USAF (Ret) and Accident Investigator / ... 11 episodes, 2022-2024
- Mark Halliley
- Â Self - Narrator 6 episodes, 2022
- Kiki Dee
- Â Self - Safety Diver 4 episodes, 2023-2024
- Evan Kovacs
- Â Self - Underwater Imaging Specialist / ... 4 episodes, 2022-2024
- Roy L. Stafford
- Â Self - Aviation Historian 3 episodes, 2022-2023
- Tamitha Skov
- Â Self - Space Weather Expert 3 episodes, 2023-2024
- Marvin W. Barrash
- Â Self - Historian / ... 3 episodes, 2022-2024
- William Toti
- Â Self 2 episodes, 2023
- Mickey Gressinger
- Â Self - Captain, Side Piece 1 episode, 2023
- Mike Dash
- Â Self - Historian 1 episode, 2022
- Sarah Conover
- Â Self - Harvey's Granddaughter and Author 1 episode, 2023
- John Bloom
- Â Self - Director, Fort Lauderdale Naval Museum 2 episodes, 2022-2024
- Mali'o Kodis
- Â Self - Marine Geologist 2 episodes, 2022-2024
- Jeff Anastas
- Â Self - Dive Safety Coordinator 1 episode, 2022
- Dave Nielsen
- Â Self - Owner of Pricus Marine 1 episode, 2023
- Michael Frohne
- Â Self - Son of Cdr Charles Frohne Jr 1 episode, 2023
- Jeff Marinko
- Â Self - Captain, Selina Grace 1 episode, 2024
- Aaron Dickerson
- Â Self - Captain, RV Explorer 1 episode, 2024
- Ross Baxter
- Â Self - Captain, Research Vessel Explorer II 1 episode, 2024
- Kathleen Marden
- Â Self - UAP Researcher and Author 2 episodes, 2022-2024
- Jeff Gammons
- Â Self - Storm Chaser and Photographer 2 episodes, 2022-2024
- Greg Mucci
- Â Self - SS John W Brown Volunteer 1 episode, 2022
- Aaron Foreman
- Â Self - Captain, Foreplay II 1 episode, 2023
- Aileen Gagney
- Â Self - Granddaughter of Harry Conover 1 episode, 2023
- Thomas Frohne III
- Â Self - Son of Cdr Charles Frohne Jr 1 episode, 2023
- Rachel Bobich
- Â Self - Marine Data Scientist 1 episode, 2023
- David Candelario
- Â Self - Safety Diver 1 episode, 2023
- Gary Jobson
- Â Self - Hall of Fame Sailor 1 episode, 2024
- John Baker
- Â Self - Salvage Diver 1 episode, 2024
- Gene Eric Salecker
- Â Self - Author & Military Historian 1 episode, 2024
- Philippe Rouja
- Â Self - Marine Scientist & Cultural Anthropologist 1 episode, 2024
- Bruce Melnick
- Â Self - NASA Astronaut 1 episode, 2022
- Laura Azevedo
- Â Self - Oceanographer 1 episode, 2022
- Thomas M. Iliffe
- Â Self - Marine Biologist 1 episode, 2022
- Joe Pruzzo
- Â Self - Castle Air Museum Executive Director 1 episode, 2022
- Scott Marchand
- Â Arizona Aerospace Foundation / ... 1 episode, 2023
- Will Hinton
- Â Self - Captain, RV Explorer 1 episode, 2023
- Phillip LaFrance
- Â Self - Captain, Aquila 1 episode, 2023
- John Bumpus
- Â Self - Safety Diver 1 episode, 2023
- Charles Tilburg
- Â Self - Marine and Environmental Scientist 1 episode, 2023
- Seth Weitz
- Â Self - Civil War Historian and Author 1 episode, 2024
- John Moseley
- Â Self - North Carolina Maritime Historian 1 episode, 2024
- Karl Kjarsgaard
- Â Self - Curator, Bomber Command Museum of Canada 1 episode, 2024
- Jim Huffstickler
- Â Self - Friend of John Tarquinio 1 episode, 2024
- Rusty Cassway
- Â Owner, Research Vessel Explorer II / ... 1 episode, 2024
- Raoul Peter Mongilardi
- Â Self - Son of Lt. Peter Mongilardi 1 episode, 2022
- Jim Flocks
- Â Self - Geologist 1 episode, 2022
- Robert J. Hanyok
- Â Self - Former Intelligence Analyst and Historian 2 episodes, 2022-2024
- Ellie Hunt
- Â Self - Granddaughter of Captain Turner 1 episode, 2023
- Beda Fanning
- Â Self - Daughter of Captain J. Fanning 1 episode, 2023
- John Myhre
- Â Self - Fight 19 Investigator 1 episode, 2023
- Peter Wilson
- Â Self - Bermudian Aviation Historian 1 episode, 2024
- Jim McKee
- Â Self - Cape Fear Historian, N.C. Historic Sites 1 episode, 2024
- Robert Haugland
- Â Self - Deckhand 1 episode, 2024
- Joseph Spillane
- Â Self - Professor, Criminal Justice, University of Florida 1 episode, 2024
- Michael Ciannilli
- Â Self - Program Director, NASA 1 episode, 2022
- Chuck Fox
- Â Self - Fisherman 1 episode, 2022
- Richard Thibedeau
- Â Self - Nephew of Herbert Thibedeau 1 episode, 2023
- Jack Cohn
- Â Self - Senior VP, Sulphur & Marine, Savage 1 episode, 2023
- Nate Ingram
- Â Self - Flight 19 Investigator 1 episode, 2023
- David Mackey
- Â Self - Massachusetts Maritime Academy 1 episode, 2023
- Peggy Sigler
- Â Self - Historian 1 episode, 2024
- Ewen Thomson
- Â Self - Marine Lightning Expert 1 episode, 2024
- Bill Tilton
- Â Self - Sheba 8-0 Survivor, USAF (Ret) 1 episode, 2024
- Nikita Shiel-Rolle
- Â Self - Biologist 1 episode, 2022
- Marshall Taft
- Â Self - Son of Retired USAF Lt. Joseph Taft 1 episode, 2022
- Nic Compton
- Â Self - Researcher & Author 2 episodes, 2023-2024
- John Mackinson
- Â Self - WWII Aircraft Mechanic 1 episode, 2023
- Andy Greig
- Â Self - Welding Engineer 1 episode, 2023
- Peter Schubert
- Â Self - ROV Pilot 1 episode, 2023
- Richard Kohler
- Â Self - Technical Diver / ... 1 episode, 2024
- George Collard
- Â Self - Antique Specialist 1 episode, 2024
- Talbot Goodyear
- Â Self - Grandson of SS Ohio and Rescuer 1 episode, 2023
- Chuck Meide
- Â Self - Maritime Archaeologist 1 episode, 2023
- Phil Wilcoxson
- Â Self - AME 3rd Class, USN 1 episode, 2023
- Tomás R. Guilarte
- Â Self - Environmental Health Scientist, FIU 1 episode, 2024
- Steve Newark
- Â Self - Former USCG Pilot 1 episode, 2023
- Chiung Tien
- Â Self - Boat Captain 1 episode, 2022
