Figure 6. B. Schematic configurations of the instrument package for broadband seismometry. All the equipment in this assembly is accessible to an ROV (remote operating vehicle). Cables from the sensors grouted at ~500 mbsf terminate in a four-way underwater-mateable connector block. The data control unit (MEG [multiple-access expandable gateway]) plugs into this connector block. A single output from the top of this package is coupled (by ROV) to the battery/recorder unit (PAT) installed after the sensors are grouted. A data recording unit (SAM) can be retrieved by an ROV when required. PAT = Power supply access terminal. SAM = storage acquistion module.