During Spectre, Bond and Swann escape Blofelds desert facility, only for it to explode.
WHY/HOW DOES THIS HAPPEN?
Bond is stripped of weapons (except the concealed explosive within his wristwatch) before entering, and as far as I could see there is no point in which he is able to sabotage the facility.
There is no point in Blofeld destroying his own facility, as Bond is an enemy of the state and a fugitive; there is no-one (except his close colleagues) on his side. There is nothing to hide in the facility, and it would result in a huge loss of personnel. Even if Blofeld wanted to hide the facility for some reason, it doesn't make any sense to just blow it up immediately, there is no motive for this.
What have I missed?