Why report it when you don't actually hit the water, just get close to it.
A Qatar Airways Boeing 787-8, registration A7-BCO performing flight QR-161 from Doha (Qatar) to Copenhagen (Denmark), departed Doha's runway 16L in night time conditions at 02:00L (23:00Z Jan 9th) and had climbed to about 1800 feet when the aircraft entered a steep descent losing 1000 feet within 24 seconds. The aircraft was subsequently recovered, climbed out and continued to Copenhagen where the aircraft landed safely about 6 hours later.
The occurrence was not reported to the authorities and only came to light later
https://avherald.com/h?article=504d75c7&opt=0