The video tell us that these 3 devices have been frozen to become a big ice cake for one and a half days, and after breaking the ice up with a hammer, these phones came out and worked totally fine through testing the touch screen and cameras according to the video.
Apart from the IP68 rating, regarding the specs, Nomu S10 comes with 5-inch HD IPS display, MTK6737T processor, 2 GB RAM, 16GB ROM of expandable storage, 8MP rear camera, 5000Amh big battery; Nomu S20 comes with 5-inch display, 8MP rear camera, MTK6737T processor, 3GB RAM, 32GB ROM of expandable storage, and 3000mAh battery capacity; Nomu S30 features 5.5-inch display with 1080P resolution, MediaTek Helio P10 octa-core processor, 4GB RAM, 64GB ROM of expandable storage, 5MP and 13MP camera, 5000mAh battery with Pump Express Plus fast charging. And of course, all of them feature IP68 certificated rating.
For what is worth, there is a promotion activity of NOMU S20 being held on Nov 11th in AliExpress, you can have more than $20 discount by purchasing this product HERE.
By the way, the third party CM 13 OS (base on Android 6.0) for Nomu S30 is almost ready and will be released soon.