You make a valid point but if the last century has shown us anything it's that our global civilisation hates the ocean (all large bodies of water really, above

You make a valid point but if the last century has shown us anything it's that our global civilisation hates the ocean (all large bodies of water really, above or below ground) and we want them gone or poisoned and dead. So if this cost even 5% more I don't see it happening.