The video does not exist anymore?
This is a test range for artillery and such. The "BLACK PORTAL" is actually a water test for munitions in a water environment, as you can see a banged up boat beside it. All the tanks that surround it are for target practice.
Anon posted a phone number to call the NAVY site.
CHINA LAKE NAVAL TEST RANGE
https://www.navair.navy.mil/node/781
https://www.navair.navy.mil/nawcwd/
Commander, Naval Air Warfare Center Weapons Division
1 Administration Circle
China Lake, CA 93555-6100
Commander, Naval Air Warfare Center Weapons Division
575 I Avenue, Bldg. 36, Suite 1
Point Mugu, CA 93042-5049
https://www.navair.navy.mil/nawcwd/Contact_NAWCWD
Contact NAWCWD
NAWCWD China Lake Public Affairs: 760-939-3511
NAWCWD Point Mugu Public Affairs: 805-427-3184