The Ministry of Defence (MOD) says it is "aware" of a video shared online, which appears to show the moment a British F-35B from HMS Queen Elizabeth crashed.
The Lightning jet's pilot, who safely ejected from their aircraft, was able to return to the Queen Elizabeth-class aircraft carrier.
An investigation into the crash was also launched.
An MOD spokesperson said: "We are aware of a video circulating online.
"It is too soon to comment on the potential causes of this incident.
"The recovery efforts are ongoing and the Defence Accident Investigation Branch will report back their preliminary findings in due course."