On September 13, 1984, Bulger, Weeks and Nee supervised the loading of "Valhalla". The final cache included "91 rifles, 8 submachine guns, 13 shotguns, 51 handguns, 11 bullet-proof vests, 70,000 rounds of ammunition, plus an array of hand grenades and rocket heads." "Valhalla" rendezvoused 120 miles off the west coast of Ireland with the "Marita Ann", an IRA ship that had sailed from Tralee. During the return voyage, the Irish Navy stopped "Marita Ann" and seized the hidden arsenal, arresting IRA members Martin Ferris, Mike Browne and John Crawley. The operation had been compromised by IRA member Sean O'Callaghan, who was an informant for the Irish National Police.