Diving Helmet with One Command Block

/summon FallingSand ~ ~2 ~ {Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{TileEntityData:{Command:"/fill ~2 ~-1 ~2 ~-2 ~4 ~14 minecraft:glass 0 hollow",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~2 ~-2 ~2 ~-2 ~-2 ~14 minecraft:bedrock 0",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~1 ~-2 ~3 ~-1 ~4 ~13 air",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~1 ~-3 ~12 ~-1 ~0 ~12 redstone_block",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"summon FallingSand ~-1 ~3 ~11 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/gamerule commandBlockOutput false\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/gamerule logAdminCommands false\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard objectives add Dhold dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"summon FallingSand ~-1 ~2 ~13 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"scoreboard objectives add air dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard objectives add DWear dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard objectives add Dcraft dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"summon FallingSand ~0 ~1 ~11 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"fill ~-2 ~4 ~3 ~2 ~4 ~-9 minecraft:bedrock 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"summon FallingSand ~0 ~1 ~-8 {id:\\\"FallingSand\\\",Block:\\\"redstone_block\\\",Time:1}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/tellraw @p [\\\"\\\",{\\\"text\\\":\\\"Command by:\\\",\\\"color\\\":\\\"gold\\\"},{\\\"text\\\":\\\"\\\\nTheRedstonePower\\\",\\\"color\\\":\\\"dark_red\\\",\\\"bold\\\":\\\"true\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"suggest_command\\\",\\\"value\\\":\\\"This is a secret? Maybe...\\\"}}]\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~2 ~3 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/fill ~1 ~ ~ ~1 ~3 ~7 stone\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"execute @a ~ ~ ~ detect ~ ~1 ~ air 0 /scoreboard players add @a[score_air=12000] air 2 {Inventory:[{Slot:103b,id:\\\"minecraft:glass\\\",tag:{display:{Name:\\\"Diving Helmet\\\"}}}]}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a[rx=-90,rxm=-90] Dhold 1 {SelectedItem:{id:\\\"minecraft:glass\\\",Count:1b,tag:{display:{Name:\\\"Diving Helmet\\\"}}}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"replaceitem entity @a[score_Dhold_min=1] slot.armor.head minecraft:glass 1 0 {display:{Name:\\\"Diving Helmet\\\"}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~1 ~3 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/fill ~-1 ~ ~ ~-1 ~3 ~7 redstone_block\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @e[type=Item] Dcraft 1 {Item:{id:\\\"minecraft:glass\\\",Count:1b}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @e[type=Item] Dcraft 2 {Item:{id:\\\"minecraft:fish\\\",Count:1b,Damage:3s,}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"execute @e[type=Item,score_Dcraft_min=2] ~ ~ ~ /execute @e[type=Item,score_Dcraft=1,score_Dcraft_min=1,r=1] ~ ~ ~ /summon Item ~ ~ ~ {Item:{id:\\\"minecraft:glass\\\",Count:1b,tag:{display:{Name:\\\"Diving Helmet\\\"},ench:[]}}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~0 ~4 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"clear @a[score_Dhold_min=1] minecraft:glass 0 1 {display:{Name:\\\"Diving Helmet\\\"}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a DWear 1 {Inventory:[{Slot:103b,id:\\\"minecraft:glass\\\",tag:{display:{Name:\\\"Diving Helmet\\\"}}}]}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players remove @a[score_DWear_min=1,score_air_min=1] air 1\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"execute @a[score_air=0] ~ ~ ~ /scoreboard objectives setdisplay sidebar\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~-1 ~4 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"execute @e[type=Item,score_Dcraft_min=2] ~ ~ ~ /execute @e[type=Item,score_Dcraft=1,score_Dcraft_min=1,r=1] ~ ~ ~ /kill @e[type=Item,score_Dcraft_min=1]\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"effect @a[score_air_min=1] water_breathing 1 0 true\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"execute @a[score_air_min=1] ~ ~ ~ /scoreboard objectives setdisplay sidebar air\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a[score_DWear=0] air 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~-2 ~5 {Riding:{TileEntityData:{Command:\"/scoreboard players set @a DWear 0 \",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a Dhold 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/setblock ~ ~-9 ~1 wall_sign 2 0 {Text1:\"===============\",Text2:\"{text:\\\"Click\\\",color:\\\"dark_red\\\",clickEvent:{action:run_command,value:\\\"/fill ~2 ~1 ~ ~-2 ~-4 ~13 air\\\"},extra:[{text:\\\" to remove\\\",color:\\\"black\\\"}]}\",Text3:\"this structure\",Text4:\"===============\"}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/setblock ~ ~-11 ~1 wall_sign 2 0 {Text2:\"{\\\"color\\\":\\\"gold\\\",\\\"text\\\":\\\"Created by\\\"}\",Text3:\"{\\\"bold\\\":true,\\\"color\\\":\\\"dark_red\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/msg @p pssst.... hey, it\\\\u0027s a secret message?\\\"},\\\"text\\\":\\\"TheRedPower\\\"}\",Text1:\"null\",Text4:\"null\",y:57,x:18,z:7,id:\"Sign\"}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~ ~-14 ~ ~-1 ~2 ~ air",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~-1 ~-15 ~ ~-1 ~-1 ~ redstone_block",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},id:"FallingSand",Block:"redstone_block",Time:1}