»In which we move it maritime style

If you need to move a sea-going rig, a passenger ferry, or bunch of other ships, you will need one of these ships for carrying giant cargo. "... a semi-submersibile heavy transport carrier ... strong resemblance to the Servant class vessels..."

I saw a similar ship carrying 220-foot tall container cranes as it motored through the San Francisco Bay to the Port of Oakland.

Models, too (although no longer commercially available. Alas!). Via Metafilter.