GoPro Hero advise please (for diving)?

Greetings All,

I'm interested in buying a gopro (my first one) for diving, and since all of them are capable of going underwater and shoot 1080P, i got confused with all the models on the market.

I already have a DSLR, and i will probably not use the hero except underwater.

I am thinking of buying a used hero 4 silver, or hero 3+ silver new… Or shall i just go with the standard Hero?

Thanks,

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