At CES yesterday, Nikon announced an interesting device: the KeyMission 360. It's a consumer device that provides 360-degree capture at 4K resolution. It stitches various views together to produce the hi-res video.
They call it a "wearable", but it looks like it might mount to the top of a helmet for 360 degree capture.
It works under water (to 100ft) and is resistant to shock, low temperatures and dust.
No word on price, but it should be available this spring.
Here's the press release (in Dutch…)