The Piranah Water 3000
Radio
Radar : radio detection and ranging .
In Britain, ASDIC.In America SONAR.Different names for the same thing!
The "u" stood for "underwater" and the term "u-boats" was and still is used in reference to WWI German submarines.
Large blimps were used in World War 2 because they could spend many hours high off shore trying to spot submarines. At 10,000 feet high, the anti-aircraft guns could not get to them. From that height, they could see underwater and could see submarines.
A Passive InfraRed Sensor (PIR)
It's called a "Motion Detector"!
A microphone detects sounds transmitted in the air.
An underwater world seed for Minecraft is used to open an underwater world to play the game in.
This sounds like it's probably the sonar system of a submarine.
sonar is a device used underwater for locating submerged objects and for submarine communication by means of sound waves.
A cloud chamber do not actually form clouds. It is a device that is used for detecting particles of ionizing radiation.
A biometer is a device which is used to detect the presence of life by detecting and measuring small amounts of evolved carbon dioxide.
Actually it is Detecting an Enemy Craft and Answer is RADAR
Radar is an object-detection system that uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircrafts.
Some Geiger counters can be used to detect gamma radiation. A better device for detecting gamma raysis a sodium iodide scintillation counter.
They used to train dolphins with cameras.