It's a submarine.
It's something I wish I had thought of.
From Splash 24/7:
With storage options for cheap crude filling up fast both on land and across a record number of tankers, one Chinese manufacturer reckons it has a solution at hand.
Low profile Chinese company Submarinergy has announced that it is ready to deliver the first batch of 5,000 ton crude crude floating storage units (CFSU) this month. The company claims each CFSU can store 35,000 barrels of oil and the construction can be completed in a few weeks. The units have a design life of 50 years in sea water, the company claims....MORE