How to use iPhone 7 to capture pictures via underwater?

How to use iPhone 7 to capture pictures via underwater? - 1

Using a WATERPROOF case or Pouch is the only approved way to do so.

The cheapest way is to put it inside a ziplock bag and seal it with one of those heat dealers so that no water gets in or if water gets it, you'll have plenty of time to get to land.

Can use an underwater casing for it or depending on how deep you are going to use it the iPhone by itself can survive to take the picture as it is IP67 water resistant.