If you download the the 3ds files of these, here is some advice on using Poseray to convert them to stable obj which will open and render with out crashing, I just copied it from my other post if it sounds familiar, "Poseray does a great job of converting 3ds files to obj, which open and render without crashes, BUT, you have to make 2 changes in Poseray's groups tab, under the faces,vertices and normals tab, first click Drop y = 0, and then to the right of that under scale and rotation reference point click origin, then all that needs to be done is click the green check mark to update the file before exporting as an object.
If you don't do this all the objects, or at least the ones I have experimented with, will be about half submerged in the surface.
SeerBlue