[1] Image of Fish

Creator NOAA Okeanos Explorer Program

License CC by-nc-sa 4.0

Source

Dimensions 700 × 498 pixels

https://search.creativecommons.org/photos/31806939-afb0-4335-b7ad-d812cc4d13ee

[2] Maelstrom Icon

Creator Anonymous

License cc0 1.0

Source

https://search.creativecommons.org/photos/3ef1f4a4-8429-42b1-92f4-ff1fdf6120ca

https://svgsilh.com/ms/009688/image/1359974.html

[3] OceanTapping Intro Music

Creator P C III 

License  CC by 4.0

Source

https://freemusicarchive.org/music/P_C_III/OceanTapping_2_Hour_Instrumental

[4] Video of Waves Crashing

Creator: Videzzy

LicenseVideezy Standard License

Source

https://www.videezy.com/water/13496-crashing-waves-on-a-rocky-beach