TNT Landmines Remove

summon falling_block ~ ~1.5 ~ {Motion:[0.0,-1.0,0.0],Time:1,DropItem:0,Block:redstone_block,Passengers:[
 {id:falling_block,Time:1,DropItem:0,Block:activator_rail},
 {id:commandblock_minecart,Command:"execute @e[name=GM4_TNTLandMines] ~ ~ ~ fill ~-1 ~ ~ ~14 ~ ~ air"},
 {id:commandblock_minecart,Command:"kill @e[name=GM4_TNTLandMines]"},
 {id:commandblock_minecart,Command:"tellraw @p [\"\",{\"text\":\"[GM4] TNT Landmines successfully removed!\",\"color\":\"aqua\"}]"},
 {id:commandblock_minecart,Command:"kill @e[type=commandblock_minecart,r=1]"}]}