A miniature yet quite detailed William Beebe & Otis Barton Bathysphere model at 1:72 scale.
Includes a small human figured at the same scale to better demonstrate the Bathysphere's size. 

No assembly required.

The 1:72 scale has been specifically selected as the one where 1 inch equals about 6ft, meaning an inch can be used to model an average human height. As well as being one of the most popular modelling scales for many vehicles, aircraft etc allowing one to place the Bathysphere to scale along such models.