Remote trigger

Hi everyone,

A question came to mind while thinking about a few shooting situations.

Do any of you use a way to remotely trigger a camera or start video recording underwater?

I’ve found myself wishing I had something like that a few times, especially for cameras left on the bottom or when trying not to get too close to shy subjects.

Just wondering if this is something people actually do in practice, and if so, what systems are being used.

Thanks!