The Norwegian frigate KNM Helge Ingstad takes on water after a collision with the tanker Sola TS, in Oygarden, Norway, Thursday Nov. 8, 2018.
The footage, which was posted on Twitter, shows the warship resting on its side in shallow water near the coastline where the vessel was beached to avoid sinking.
The Helge Ingstad was returning from the NATO Trident Juncture 18 exercises when it collided with the Maltese oil tanker Sola-which is reportedly undamaged and resuming its route from Norway to a terminal in northeast England, according to the website Marine Traffic.
"We are working on stabilizing the vessel", Norwegian Navy Counter-Admiral Nils Andreas Stensoenes told a news conference, adding that the eight injured were all Navy crew.
Tanker said not to suffer serious damages, as of 0530 UTC she was near collision site, moving in northern direction at dead slow speed, escorted by tug. Two are being treated in hospital.
Johan Marius Ly of the Norwegian Coast Guard said the 442ft frigate, which had recently taken part in the North Atlantic Treaty Organisation drill Trident Juncture, was listing, adding: "We have been told that there is a leak from the frigate".
"According to our assessments, there's no reason to believe that anything, like an accident, could happen with the weapons" on board, he said.
Meanwhile, the 62,000-tonne oil tanker, which was flying the Maltese flag but is owned by a Greek shipping company, was only slightly damaged and none of the 23 people on board were injured, the rescue centre said.
Police and the national Accident Investigation Board were investigating the accident, which took place at 0326 GMT. The fuel was expected to evaporate quickly.
The Sture oil terminal and the Kollsnes gas processing plant were shut down as a precautionary measure. The ship had recently participated in the Trident Juncture exercise, one of NATO's largest training events in recent years.
The KNM Helge Ingstad has been listing dangerously since Thursday's collision in the Hjeltefjord near Bergen.