Table 7.

Comparison of Various Underwater Wireless Sensor Networks.

Reference	Application	Network Deployment			Communication		Sensor Node
		Salinity Level	Network size	Operable Depth	Channel Frequency	Type	Type	Distance	Number
[116]	Fish farm	Ocean	Up to 2.4 km	30 m	26.8 kHz	RF, Acoustic	Static	6 m	5
[117]	River Monitoring	River	5000 m × 200 m	50 m	35 kHz	Acoustic	Mobile	300 m	2
[118]	Ocean Monitoring	Shallow Water	90 × 38 × 45 cm	Up to 3 m	433 MHz	RF, Acoustic	Static	15 cm	2
[119]	Environmental Monitoring	Sea	Up to 2 km	2 m	28 kHz	RF, Acoustic	Static	100 m	3
[120]	Water Quality	Sea	4500 to 5500 m3	45 m	25 to 40 KHz	RF, Acoustic	Static	110 m	3
[121]	Surveillance	Sea	23 km × 30 km × 300 m	50 m	1 kHz to 4 kHz	Acoustic	Mobile	75 m	2
[122]	Target Tracking	Sea	Up to 1 km	32 m	2 kHz	Acoustic	Mobile	300 m	2
[123]	Exploration	Sea	14.5 m × 12 m	2 m	2 kHz	Acoustic	Mobile	10 m	3
[124]	Survey Planning	Sea	600 m × 600 m	20 m	1 kHz to 4 kHz	Acoustic	Mobile	10 m	2
[125]	Target Tracking	Sea	30 m × 30 m × 25 m	25 m	2 kHz	Acoustic	Mobile	4 m	6
[126]	Surveillance	Sea	400 m × 400 m × 400 m	20 m	3 kHz	RF, Acoustic	Static	20 m	4
[127]	Surveillance	Ocean	Up to 3 km	90 m to 98 m	25.6 kHz	RF, Acoustic	Static, Mobile	No Info	7
[128]	Exploration	Sea	600 m × 900 m	Up to 80 m	3 kHz	Acoustic	Mobile	75 m	2
[129]	Ocean Sampling	Ocean	500 m × 500 m	10 m	2 kHz	Acoustic	Mobile	10 m	2