In "Before the flood" (S09E04), when the damn breaks and security protocol 712 is activated in the Tardis, I'm assuming it returned to the present (year 2119 where Clara is) with Bennett.
How did the Doctor return? Did he sleep till the year 2119 in suspension chamber in the space hearse? If not how else did he wake up in it?
"And saying the chamber will open?" "That was me telling me to get inside and when to set it for."