Hello fellow Stressers!!

I'm a bit confused by this statement which I found on some technical article:

"Soil stiffnesses calculated on embedded or semi-embedded pipe should take account of the buoyancy effect
of the water, e.g unit weight of the soil 114 pcf - weight of the seawater (64 pcf) = 50 pcf"

My question is why we need to get the difference in soil unit weight to sea water unit weight for the buoyancy effect. If the pipe is embedded then I think there will be no buoyancy effect since it will be isolated by the soil?

Please correct my interpretation of the topic in case I'm wrong.

Appreciate your opinion on the subject.

Thanks in Advance,