Bathymetry is the mapping of under water structures, and is very important for monitoring bodies of water. Generally, bathymetric maps are represented on a single plane as a series of circles marking areas of equivalent depth. (National Geographic)
However, using 3D modeling software and 3D printing, we can create a more emersive representation. Using optical character recognition, GPS, and the depth readout from a sonic fish finder, we can create a series of 3-dimesional coordinates representing a disperse point map of underwater structures. Using graph algorythms, that point map can be fed into a free modeling software called Blender using its scripting functionalities to join the point map into faces and 3D geometry.
That 3D model can be scaled, edited, and printned in a 3D printer to create ultra-accurate physical models of underwater structures.