Set command block with command problems

When using the command

/setblock 316 30 -1390 minecraft:command_block 0 replace {Command:"/title @a subtitle {text:"--3 Chambers Remain--",color:"gold"}"}

the command will not work as it says data tag parsing failed as it says in the 'text' field the '-' is unexpected although it should not be looking at this as it is after the ". The command works if I remove the " " around the text however the actual command

/title @a subtitle {text:"--3 Chambers Remain--",color:"gold"}

doesn't work without the " ".