Source: CBBC
13. The Abyss Stares Back
21-05-2018
CBBC
All episodes
12. The Phantom Sub
18-05-2018
11. Monster Hunter
17-05-2018
10. Colossal Squid
16-05-2018
9. Fossil
15-05-2018
8. The Test
14-05-2018
7. Captured
11-05-2018
6. Lonesome Jim
10-05-2018
5. The Devil's Sea Mystery
09-05-2018
4. Digging Deeper
08-05-2018
3. A.i.m.y.
07-05-2018
Series 2: 8. Hidden Secrets
25-04-2018
Series 2: 10. Whale Of A Time
27-04-2018
Series 2: 4. Treaturous Waters
19-04-2018
Series 2: 12. Thunder And Lightening
01-05-2018
Series 2: 3. Mermaids
18-04-2018
