2E-- 



.-I- 



Fig 1 18 ORE subbottom profiler, transducers and recorder, (NAVOCEANO) 



rate and paper speed in the recorder are 

 selectable. 



Data: The system (O.R.E. Model 1200 

 Subbottom Profiler) provides a record of the 

 ocean bottom and its substructure under the 

 submersible's track. 



Pulse Length: 0.3, 0.5, 1.0 and 2.0 milli- 

 seconds. 



Sweep Rate: 50, 100, and 200 sec. 



Paper Speed: 100, 200, 300, and 500 

 scans/in. 



d. Bottom Samples: 



The floor of the ocean may range from soft, 

 soupy, mud plains (unconsolidated) to hard 

 rock (consolidated) cliffs. Between the two 

 ranges is a variety of combinations. To ob- 

 tain samples of both consolidated (hard) and 

 unconsolidated (soft) materials a variety of 

 instruments has been developed and used. 

 The reader is urged to consult reference (6) 

 for a detailed and comprehensive discussion 

 of these devices. 



1. Unconsolidated Sediments 



Cores — (Fig. 11.9) By pressing a hol- 

 low, narrow cylindrical tube into the sedi- 

 ment with the vehicle's manipulator, sedi- 

 ment samples up to 3 feet in length have 

 been obtained. An exploded view of this de- 



vice is shown in Figure 11.10. Benthos Inc. 

 (10) manufactured a 6-barrelled piston corer 

 specifically for DEEP QUEST which drives a 

 4-foot-long, 2.6-inch-diameter corer into the 

 sediment with a pair of shock cords. A drive 

 shaft retracts the core tube from the sedi- 

 ment. 



Scoops — (Fig. 11.9) Anything from a 

 tin can to a specially designed scoop has been 

 used with a manipulator to obtain a shallow 

 sample of the bottom. 



Dredges — (Fig. 11.9) A steel mesh 

 dredge may be mounted under the bow of the 

 submersible and by running along the bot- 

 tom the vehicle can scoop up large fragments 

 while sifting out the fines. 



Grabs — Merely picking up and stor- 

 ing of rock fragments is accomplished 

 through the vehicle's normal grasping hand. 

 Using both manipulators DEEP QUEST re- 

 trieved a 328-pound rock from 2,800 feet. 



2. Consolidated Sediments 



Drills — Hard rock rotary drills have 

 been developed and used by Woods Hole 

 Oceanographic Institution and International 

 Hydrodynamics Corporation (11), and are ca- 

 pable of taking 4-inch x 0.75-inch and 10-inch 

 X ^/s-inch cylindrical cores, respectively. The 

 WHOI corer (Fig. 11.11) is held in the manip- 



550 



