Here is a waterproof housing for iPhone 7 that lets you capture spectacular videos underwater. The Watershot iPhone 7 PRO housing has a machined 6061 Aluminum lens port and interchangeable lens port mount. It is rated to a depth of 195 feet. You get 5 conductive pressure buttons and an ergonomic finger grip.
Watershot PRO protects your smartphone and lets you take it with you underwater to capture videos and photos. It weighs 0.8lbs. Will cost $179.99.[Source]