The latest version of BlueKenue 3.2.31 (available on the WEB)
allows you to import 2dm files containing triangular meshes.
1. "File->Import->SMS 2DM Mesh"
2. Create a new Selaphin object "File->New->SELAFIN Object"
3. In the WorkSpace drag the 2DM mesh onto "newSelafin"
4. Change the name of the mesh to BOTTOM or whatever is appropriate (on the Metadata tab of its property pages)
5. Save the Selafin object, and you're done.
Cheers... Martin