You can't delete the command, throw a water_bucket on any piece of iron armor, or sword, to get that type of scuba gear.
How to install
How to import this command into your world
First, you must give yourself a command block (If you are on a server, you must be 'OP'ed, and have access to /gamemode 1)
To get a command block, type
/give @p command_block in the chat.
Once you have a command block, right click it to open it's GUI.
Now, you must copy and paste the command from your browser into the game. Select the entire command from below, then right click and press 'copy'.
Next, go back to your minecraft world, and paste the command you just copied into the command block. There are a few different keys that may be used to do this, depending on your keyboard. The most common ones are 'CTRL + V', 'COMMAND + V', or 'STRG + V'
Finally, you can press done to exit the GUI, and execute the command block by powering it with a redstone block, a lever, or any thing you can get your grubby hands on. Just make sure you don't place it on top of the command block, or the machine will not be installed!
Show source commands
# This user did not upload the source commands!
/summon MinecartCommandBlock ~ ~1 ~ {Command:kill @e[type=MinecartCommandBlock,r=1],Riding:{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block,Riding:{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air},Riding:{id:MinecartCommandBlock,Command:"/scoreboard objectives add crafted dummy",Riding:{id:MinecartCommandBlock,Command:"/scoreboard objectives add onGround dummy",Riding:{id:MinecartCommandBlock,Command:"/scoreboard objectives add item dummy",Riding:{id:MinecartCommandBlock,Command:"/scoreboard teams join Scuba",Riding:{id:MinecartCommandBlock,Command:"/scoreboard teams add Scuba",Riding:{id:MinecartCommandBlock,Command:"/tellraw @p [\"\",{\"text\":\"Command Created by Thewithergamer96 (Click to get to my youtube channel)\",\"color\":\"green\",\"italic\":true,\"clickEvent\":{\"action\":\"open_url\",\"value\":\"https://www.youtube.com/channel/UCVGtBhOpFES8biIBcgs5J9Q/videos\"}}]",Riding:{id:MinecartCommandBlock,Command:"/tellraw @p [\"\",{\"text\":\"Installed Scuba Gear!\",\"color\":\"aqua\",\"italic\":true}]",Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~-2 ~-1 {Command:fill ~ ~ ~1 ~5 ~2 ~1 stone},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~-2 ~1 {Command:fill ~ ~ ~-1 ~5 ~2 ~-1 redstone_block},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~-2 ~-1 {Command:"scoreboard players set @e[type=Item] onGround 0 {OnGround:0b}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~-2 ~1 {Command:"scoreboard players set @e[type=Item] onGround 1 {OnGround:1b}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~5 ~-2 ~-1 {Command:"scoreboard players set @e[type=Item] item 1 {Item:{id:minecraft:iron_helmet}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~5 ~-2 ~1 {Command:"scoreboard players set @e[type=Item] item 2 {Item:{id:minecraft:water_bucket}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~6 ~-2 ~-1 {Command:"execute @e[type=Item,score_item_min=1,score_item=1,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=2,score_item=2,score_onGround_min=1,r=1] ~ ~ ~ scoreboard players set @e[type=Item,r=1] crafted 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~6 ~-2 ~1 {Command:"execute @e[type=Item,score_item_min=1,score_item=1,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=2,score_item=2,score_onGround_min=1,r=1] ~ ~ ~ /summon Item ~ ~1 ~ {Item:{id:iron_helmet,Count:1,tag:{Unbreakable:1,display:{Name:Scuba Helmet,Lore:[Respiration V?]},ench:[{id:5,lvl:5}]}}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~7 ~-2 ~-1 {Command:"execute @e[type=Item,score_crafted_min=1,c=1] ~ ~ ~ /particle smoke ~ ~ ~ 0.1 0.5 0.1 0.1 100"},Riding:{id:MinecartCommandBlock,Command:blockdata ~7 ~-2 ~1 {Command:"execute @e[type=Item,score_crafted_min=1,c=1] ~ ~ ~ /playsound random.anvil_use @a[r=10] ~ ~ ~ 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~8 ~-2 ~-1 {Command:"kill @e[type=Item,score_crafted_min=1]"},Riding:{id:MinecartCommandBlock,Command:blockdata ~8 ~-2 ~1 {Command:"scoreboard players set @e[type=Item] item 3 {Item:{id:minecraft:iron_chestplate}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~-1 ~-1 {Command:"scoreboard players set @e[type=Item] item 4 {Item:{id:minecraft:water_bucket}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~-1 ~1 {Command:"execute @e[type=Item,score_item_min=3,score_item=3,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=4,score_item=4,score_onGround_min=1,r=1] ~ ~ ~ scoreboard players set @e[type=Item,r=1] crafted 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~-1 ~-1 {Command:"execute @e[type=Item,score_item_min=3,score_item=3,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=4,score_item=4,score_onGround_min=1,r=1] ~ ~ ~ /summon Item ~ ~1 ~ {Item:{id:iron_chestplate,Count:1,tag:{Unbreakable:1,display:{Name:Scuba Tank,Lore:[Breath More]},ench:[{id:5,lvl:10},{id:7,lvl:10}]}}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~-1 ~1 {Command:"scoreboard players set @e[type=Item] item 5 {Item:{id:minecraft:iron_leggings}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~5 ~-1 ~-1 {Command:"scoreboard players set @e[type=Item] item 6 {Item:{id:minecraft:water_bucket}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~5 ~-1 ~1 {Command:"execute @e[type=Item,score_item_min=5,score_item=5,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=6,score_item=6,score_onGround_min=1,r=1] ~ ~ ~ scoreboard players set @e[type=Item,r=1] crafted 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~6 ~-1 ~-1 {Command:"execute @e[type=Item,score_item_min=5,score_item=5,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=6,score_item=6,score_onGround_min=1,r=1] ~ ~ ~ /summon Item ~ ~1 ~ {Item:{id:iron_leggings,Count:1,tag:{Unbreakable:1,display:{Name:Scuba Pants,Lore:[More Protection]},ench:[{id:0,lvl:10},{id:8,lvl:5}]}}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~6 ~-1 ~1 {Command:"scoreboard players set @e[type=Item] item 7 {Item:{id:minecraft:iron_boots}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~7 ~-1 ~-1 {Command:"scoreboard players set @e[type=Item] item 8 {Item:{id:minecraft:water_bucket}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~7 ~-1 ~1 {Command:"execute @e[type=Item,score_item_min=7,score_item=7,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=8,score_item=8,score_onGround_min=1,r=1] ~ ~ ~ scoreboard players set @e[type=Item,r=1] crafted 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~8 ~-1 ~-1 {Command:"execute @e[type=Item,score_item_min=7,score_item=7,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=8,score_item=8,score_onGround_min=1,r=1] ~ ~ ~ /summon Item ~ ~1 ~ {Item:{id:iron_boots,Count:1,tag:{Unbreakable:1,display:{Name:Scuba Boots,Lore:[Go faster!]},ench:[{id:0,lvl:5},{id:8,lvl:10}]}}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~8 ~-1 ~1 {Command:"scoreboard players set @e[type=Item] item 9 {Item:{id:minecraft:iron_sword}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~ ~-1 {Command:"scoreboard players set @e[type=Item] item 10 {Item:{id:minecraft:water_bucket}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~ ~1 {Command:"execute @e[type=Item,score_item_min=7,score_item=7,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=8,score_item=8,score_onGround_min=1,r=1] ~ ~ ~ scoreboard players set @e[type=Item,r=1] crafted 1"},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~ ~-1 {Command:"execute @e[type=Item,score_item_min=7,score_item=7,score_onGround_min=1] ~ ~ ~ execute @e[type=Item,score_item_min=8,score_item=8,score_onGround_min=1,r=1] ~ ~ ~ /summon Item ~ ~1 ~ {Item:{id:iron_sword,Count:1,tag:{Unbreakable:1,display:{Name:Scuba Sword,Lore:[Fight Underwater]},ench:[{id:20,lvl:10},{id:21,lvl:10}]}}}"},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~ ~1 {Command:"/effect @a[team=Scuba] 16 30 1"},Riding:{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ redstone_block,Riding:{id:MinecartCommandBlock,Command:fill ~3 ~-2 ~-1 ~4 ~ ~-1 command_block,Riding:{id:MinecartCommandBlock,Command:fill ~3 ~-2 ~-1 ~8 ~-1 ~-1 command_block,Riding:{id:MinecartCommandBlock,Command:fill ~3 ~-2 ~1 ~4 ~ ~1 command_block,Riding:{id:MinecartCommandBlock,Command:fill ~3 ~-2 ~1 ~8 ~-1 ~1 command_block,Riding:{id:MinecartCommandBlock,Command:fill ~2 ~-2 ~-2 ~9 ~ ~2 stained_glass 3 replace stained_hardened_clay 3,Riding:{id:MinecartCommandBlock,Command:fill ~2 ~-3 ~-2 ~9 ~1 ~2 stained_hardened_clay 3 hollow,Riding:{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false,Riding:{id:MinecartCommandBlock,Riding:{id:FallingSand,Block:activator_rail,Time:1,Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:stone,Time:1}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}