Announced United States Nuclear Tests -- By Event Event Name... Mars Date (GCT) = _ Location -. asta ae Type '.!. Purpose eSeB Yield Range 09/28/58 NTS Tunnel Safety Experiment 13 tons Marsh 09/06/75 NTS Shaft Weapons Related Less than 20 kt Marshmallow 06/28/62 NTS Tunnel WeaponsEffects Low Marsilly 04/05/77 NTS Shaft Weapons Related 20 to 150 kt Marvel Emplacement technique experiment 09/21/67 NTS Shaft Piowshare 2.2 kt Mast 06/19/75 NTS Shaft WeaponsRelated 200 to 1000 kt Mataco 06/14/63 NTS Shaft WeaponsRelated Low Mauve 08/06/65 NTS Shaft Weapons Related Less than 20 kt Maxwell 01/13/66 NTS Shaft WeaponsRelated Less than 20 kt Mazama No radioactive release detected 10/29/58 NTS Tower Weapons Related Zero Memory 03/14/79 NTS Shaft Weapons Related Less than 20 kt Mercury 09/23/58 NTS Tunnel Safety Experiment Slight Merlin 02/16/65 NTS Shaft Weapons Related 10.1 kt Merrimac Accidental release of radioactivity 07/13/62 NTS Shaft WeaponsRelated Intermediate Mesitta Operation Dominic 05/09/62 Christmas Island area Airdrop Weapons Related intermediate Slight venting, radioactivity not detected off site DoD Event Accidental release of radioactivity detected onsite only Accidental! release of radioactivity detected onsite only No radioactive release detected Accidenta! release of radioactivity detected onsite only detected on site only -83-