P&G platforms after Deep Water Horizon - sustainable or not?

Hundreds of millions years the ocean is running waves and winds and after so long nothing is planted above waters everything plants underwater.

Why P&G platforms do not follow this simple law of nature and do avoid at least half of its sustainability problems?

For sure submersible platform will require other rules of construction and operation.

Platforms might become underwater towns with shape different of current butwinning independence of surface conditions.

Related to above hints why do not apply a dual buoyancy conception to petrol transporters making them submersible and semi submersible train floaters? (See Pelamis)

Second aspect which still endangers P&G platforms is sea bed geological behavior and related anomalies but how the marine species survive those troubles over hundreds millions of years?

What make species different of platforms?

One is confirmative – most creatures of nature floating between seabed and surface are not rigid.

What future features P&G platforms shall posses?

1. Adequate reaction to slow and quick water anomalies

2. Integrating and differentiating ballasts

3. Shock resistant body conception etc.