Walruses have been long thought to be grazing feeders, scooping up clams from the sea floor. However, when walruses bodies have been examined by scientists, frequently the remains of seals are found in their stomachs. This has led to the speculation that walruses hunt seals, however, apparently this behavior has not been observed because it would take place under water, if it occurred. The Wikipedia merely says that the "importance of seals in the walrus diet is under debate". Has anyone ever filmed a walrus hunting, catching and eating a seal under water?