List of episodes:
Series one
1. Here Be Dragons (Tom Taylor)
2. Dark Orca (David Evans)
3. A.I.M.Y. (Daniel Hall)
4. Digging Deeper (Tom Taylor)
5. Devil's Sea Mystery (Tom Taylor)
6. Lonesome Jim (Philip Dalkin)
7. Captured (Tom Taylor and Daniel Hall)
8. The Test (Philip Dalkin)
9. Fossil (Philip Dalkin)
10. Colossal Squid (David Evans)
11. Monster Hunter (Lawrence Leung and Philip Dalkin)
12. The Phantom Sub (Daniel Hall)
13. The Abyss Stares Back (Justine Gillmer)
14. Junior Nektons (Kate McCartney and Philip Dalkin)
15. Treasure of the Islanders (John Armstrong)
16. Tunnel (David Evans)
17. The Sunken Gallery (Daniel Hall)
18. Field of Giants (Justine Gillmer)
19. The Proteus Factor (Philip Dalkin)
20. Song of the Siren (Tom Taylor)
21. Bad Luck Fish (Daniel Hall)
22. Strange Migration (Philip Dalkin)
23. Bloop (Justine Gillmer)
24. The Twilight Zone (Philip Dalkin)
25. Loki's Castle (Daniel Hall and Philip Dalkin)
26. Tartaruga (Tom Taylor)
Series two
1. From the Stars (Tom Taylor)
2. The Baltic Sea Anomaly (Philip Dalkin and David Evans)
3. Mermaids (Sam Carroll)
4. Treacherous Waters (Ray Boseley)
5. Kenji's Monster (Daniel Hall)
6. Finn Comes Aboard (Rachel Spratt)
7. Beware the Sentinels (Thomas Duncan-Watt)
8. Hidden Secrets (Philip Dalkin)
9. The Maze (Thomas Duncan-Watt)
10. Whale of a Time (Sam Carroll)
11. The Missing (Tom Taylor)
12. Thunder and Lightning (Philip Dalkin and Rachel Spratt)
13. The Gates (Philip Dalkin)
Series three
1. The Treasure
2. Off Line (Thomas Duncan-Watt)
3. Friends in Deep Places
4. Just Eaten
5. Family Ties
6. The Circle Game
7. The Unicorn
8. Purple Tide (Cleon Prineas)
9. The Race
10. Kidnapped
11. More Thunder and Lightning
12. Lemuria
13. The Sceptre
