Please refer to the following table:

Accessory	Dive Case	Venture Case
Best Used	Under water	Above water
Waterproofing	Waterproof up to 30 meters	Waterproof up to 5 meters
Stitching under water	Yes	No
Bottom stitching	Due to the design of the case, the bottom of the footage will show the case.	The bottom of the footage won't show the case

Yes, there is a 1/4 screw on the bottom of the case, which can be used with the official invisible selfie stick. However, the Dive Case is best used at a 90 degrees angle to the stick, to keep the bottom of the case out of frame when aimed at you, therefor the stick is not invisible in videos.

Please refer to the details in the papery manual for use.

Yes, the dive case and venture case use different stitching algorithms, so after shooting, please open the app or Studio, select the corresponding "Stitch for waterproof case", "Dive case(under water)" or "Dive case(above water)" to optimize stitching.