Seismic monitoring below source tool

A sensory assembly system for use with a wellbore comprising:

• a tube assembly comprising:
• an assembly casing having an upper end and a lower end;
• a sheathed cable mounted to the upper end of the assembly casing, the sheathed cable having a cladding with at least a fiber optic cable within the cladding;
• a sensory tool module mounted within the assembly casing and mechanically coupled to the sheathed cable, where the fiber optic cable extends out of the sheathed cable and past the sensory tool module;
• a weight module mechanically coupled to a downhole end of the fiber optic cable;
• and
• an assembly valve mechanically coupled to and defining the lower end of the assembly casing;
• a well head assembly, having a well head valve providing access to a wellbore, constructed to couple with the tube assembly, wherein when the fiber optic cable is at least in part extended between the sensory tool module and the weight module, and wherein when either or both of the assembly valve and well head valve are closed, the fiber optic cable is severed;
• and
• an interrogator system, coupled to the sheathed cable, configured to control the sensory tool module.