After things are running better ships or boats would be good.
how bout putting the tinkers to work in the Rach tradition and let them build deep sea divers suites. Under water lost citys could be a neat place to go.Ships could be built just like houses even have some storage.perhaps a carpenter school spinoff - Ship Building. After we have adapted to using our seas may be a good spot for new race of mermaids and men to live. definitly a place to find sea monsters id imagine