Recent technological advancement in manned and unmanned undersea vehicles…
2025
Recent technological advancement in manned and unmanned undersea vehicles overcome some of the limitations of divers equipment. Without a vehicle, divers often became sluggish and their mental concentration was limited. Because of undersea pressure that affected their minds, concentration among divers was difficult or impossible. But today, most oceanographers make observations by means of instruments that are lowered into the ocean or from samples taken from the water. Direct observations of the ocean floor are made not only by the divers but also by deep-diving submarines. Some of these submarines can dive to depths of more than several miles and cruise at depths of 15 thousand feet. Radio-equipped buoys can be operated by remote control in order to transmit information back to land-based laboratories including data about water temperature, currents, and weather. Some of mankind’s most serious problems, especially those concerning energy and food may be solved with the help of observations made possible by these undersea vehicles.
Undersea vehicles
- A.
are technologically primitive
- B.
make direct observations of the ocean floor
- C.
are very slow to respond
- D.
are too small for a man to fit inside
Attempted by 5 students.
Show answer & explanation
Correct answer: B
Answer: make direct observations of the ocean floor.
The passage states: "Direct observations of the ocean floor are made not only by the divers, but also by deep-diving submarines."
This sentence directly indicates that undersea vehicles are used to make direct observations of the ocean floor, so the best completion is the phrase "make direct observations of the ocean floor."