Mr. Mitrokhin also transcribed the finding aids to three radio caches in Belgium. I won't go through the details. That is described in my written evidence. In the Austrian, Swiss, and Belgian examples, the fact that the authorities had learned the location of the caches from the Mitrokhin archive had not been revealed until the publication last month of our book, The Sword and the Shield. There is no doubt that similar caches exist in the United States.

   The United States, ''the main adversary,'' to quote KGB jargon, was, of course, an enormously more important target for KGB sabotage operations than Austria, Switzerland, or Belgium. Though Mr. Mitrokhin didn't transcribe the detailed finding aids to any of the KGB arms caches in the United States, his notes make clear that these caches were an integral part of sabotage operations against U.S. targets. KGB files revealed, for example, that in 1966, KGB sabotage and intelligence groups, DRG's, to quote their acronym, largely composed of Sandinista guerrillas, were established on the Mexican-U.S. border with support bases in the area of Ciudad Juarez, Tijuana, and Ensenada. The Sandinista leader, Carlos Fonseca Amador, code named Hydrologist, his KGB code name, was a trusted KGB agent. His file was noted by Mitrokhin.

   Among the chief sabotage targets across the U.S.-Mexican border were military bases, missile sites, radar installations, and the oil pipeline code named START, which ran from El Paso in Texas to Costa Mesa in California. Three sites on the California coast were selected for DRG landings, together with large capacity caches in which to support mines, explosives, detonators, other sabotage material. A support group code named Saturn was tasked with using the movements of migrant workers to conceal the transfer of agents and the munitions across the borders. And further details of that are given in my written testimony.

Canada in the north, like Mexico in the south, was intended as a base for cross-border operations by DRGs against the main adversary. In 1967 a number of frontier crossings were reconnoitered, among them areas near the Lake of the Woods and the International Falls in Minnesota and in the regions of the Glacier National Park in Montana.

   According to a KGB file, and it may well be right, one of its targets in Montana, the Flathead Dam, I quote, ''generated the largest power supply system in the world,'' end quotes, which is why it was a major KGB target. It identified a point, code named Doris, on the South Fork River about three kilometers below the dam where a DRG could bring down a series of pylons on a steep mountain slope that would take a lengthy period to repair.

   The KGB also planned a probably simultaneous operation in which DRG commandos would descend on the Hungry Horse Dam at night, take control of it for a few hours, sabotage its sluices. Two large caches, code named Park and Kemi, were sighted in northwestern Montana, almost certainly for use by the saboteurs.

   Other arms caches in the northern United States include two in Minnesota code named Aquarium 1 and Aquarium 2. I want to emphasize in our book Vasili Mitrokhin and I did not seek to sensationalize these caches. On the contrary, we avoided giving even the approximate locations of any of them for reasons of public safety. Any or all of them may now be in dangerous condition. But on the basis of inside information apparently from somebody in the United States with access to Mitrokhin's material, ''Nightline'' has correctly identified the location of one of them as Minnesota sites, as in the Brainerd region.