I’m no expert in the field, but under the right conditions, possibly. But that would also be incredibly unlikely. The oceans are so full of life that something would feed on the remains, and even if not it would be more likely to decompose than be preserved. Bacteria is everywhere, including in the ocean, and bacteria is a significant component in decomposition.

I believe the brine solution we use for preserving food is a much higher salt concentration than sea water.