I really don't know what's possibile and reasonable for honours project, but here's something that interests me and has some relation to freediving. And was brought up in these forums already, regarding pinguins, but can be related to many other air-breathing marine animals.
Do air-breathing marine animals (well, diving mamals and birds) get their diving adaptations from a training response or genetics (my guess is both, but to what extent?).
Checking hemoglobin, myoglobin (if possible to sample without killing) (and maybe other blood contents that might affect viscosity due to high hemoglobin) levels in marine animals in nature and captivity (where they can't dive deep).
Also graphing by age.
I don't know if that would fit such a project.
I'm not sure if such conclusions (yes / no / both / seals yes / pinguins not / unexpected results) would justify the project in the eyes of your professors, since they might not care much for freediving as us.
Maybe you could think of something better which combines both?
Good luck.
Tell us what you chose. I might have to do one of those stuff myself in the future.
