Danish fishing trawler nets sub

[amit21mech]

A Danish trawler made a surprise catch on Monday when it found a German submarine in its net off the coast of northern Denmark.

The trawler Marie Helene was fishing in the Skagerrak waters between Norway and Denmark, about 20 nautical miles off the Danish port of Hirtshals, when it made its unusual catch.

The German submarine was participating in NATO maneuvers when it got caught in the trawler's nets, forcing it to rise to the surface, much to the shock of the Danish fishermen on board.

"The crew of the trawler was never in danger, they were more scared than anything else," Danish sea rescue officials told the news agency AFP.

"But the trawler's nets were not able to withstand (the weight of) this extraordinary catch," a sea rescue duty officer said. While it took hours for rescue teams to remove the submarine from the trawler's nets, the Danes played the incident down.

"A German vessel helped the captured submarine to disentangle itself and continue on its route," he added.

"Except for a damaged trawler, it was rather undramatic," Alex Jensen, a Danish Navy spokesman said.

This is not the first time a Danish fishing boat has had a close shave with a submarine in the region. In March 1984, three fishermen were killed when their trawler was pulled to the bottom by a German submarine caught up in its nets


http://www.dw-world.de/dwelle/allgemein/bilder_show/0,3772,43199_1,00.jpg

 

[adsH]

i Mean they say these subs are high tech talk about high tech equipment why can't they detect these Boats on the surface like the Japanese Cruise ship carrying Kids !!

 

[amit21mech]

i Mean they say these subs are high tech talk about high tech equipment why can't they detect these Boats on the surface like the Japanese Cruise ship carrying Kids !!

I think they have the tech to detect boats on the surface but do not have anything to detect the fishing net. Well it will be very interesting to know what signature the fishing net will have on sub's radar? Anyone got any idea?

 

[adsH]

i Mean they say these subs are high tech talk about high tech equipment why can't they detect these Boats on the surface like the Japanese Cruise ship carrying Kids !!

I think they have the tech to detect boats on the surface but do not have anything to detect the fishing net. Well it will be very interesting to know what signature the fishing net will have on sub's radar? Anyone got any idea?

i think its more of sonar thing or some other sensor the radar, are you sure subs have radars, well if they do its more or likely that they won't get a feedback from the fishing net, what do you think .

 

[amit21mech]

>>> i think its more of sonar thing or some other sensor the radar, are you sure subs have radars, well if they do its more or likely that they won't get a feedback from the fishing net, what do you think <<<


To locate a target, a submarine uses active and passive SONAR (sound navigation and ranging). Active sonar emits pulses of sound waves that travel through the water, reflect off the target and return to the ship. By knowing the speed of sound in water and the time for the sound wave to travel to the target and back, the computers can quickly calculate distance between the submarine and the target. Whales, dolphins and bats use the same technique for locating prey (echolocation). Passive sonar involves listening to sounds generated by the target. So it is SONAR which should have been used by Submarine to detect a "fishing net" but due to its structure only signature a "fishing net" will provide will be equal to a herd of small fishs.

 

[Revival_786]

LOL!!!! Oh man this is too funny!!!! ROFL!!! :rolling

 

[adsH]

>>> i think its more of sonar thing or some other sensor the radar, are you sure subs have radars, well if they do its more or likely that they won't get a feedback from the fishing net, what do you think <<<


To locate a target, a submarine uses active and passive SONAR (sound navigation and ranging). Active sonar emits pulses of sound waves that travel through the water, reflect off the target and return to the ship. By knowing the speed of sound in water and the time for the sound wave to travel to the target and back, the computers can quickly calculate distance between the submarine and the target. Whales, dolphins and bats use the same technique for locating prey (echolocation). Passive sonar involves listening to sounds generated by the target. So it is SONAR which should have been used by Submarine to detect a "fishing net" but due to its structure only signature a "fishing net" will provide will be equal to a herd of small fishs.

Thats a big problem if the Subs like the germans subs operate in fishing waters. the problem would be solved if the Fishing nets are equipped with aqustic noise producers!! for the sub sonars to detect them. :smokingc:

 

[Pathfinder-X]

fish net is very effective at keeping submarines out of narrow sea passages. in WW2, the U.S navy deployed large nets at entrance of pearl harbour to keep the jap subs out. fortunately, the japs mostly used their sub as sea transport instead of using them to distrupt convoys, one of the reasons japs lost the pacific war.

 

[Ryan]

Around five years ago some friends and I were about 5 kms off the coast of Western Australia doing some fishing when an RAN submarine surfaced about 100 metres away, surfaced for about 2minutes then dived.Now we were just a speck on the surface in the middle of the ocean, apparently this is quite common around the area.
I don't know much about sonar and underwater technologies, but what do submarines use to detect tiny surface vessels?

 

[adsH]

Around five years ago some friends and I were about 5 kms off the coast of Western Australia doing some fishing when an RAN submarine surfaced about 100 metres away, surfaced for about 2minutes then dived.Now we were just a speck on the surface in the middle of the ocean, apparently this is quite common around the area.
I don't know much about sonar and underwater technologies, but what do submarines use to detect tiny surface vessels?

I think its sonar pulses they are very primative in terms of Sensors realy but i know what they can do to prevent accidenets such as those they should give every Vessel like Civilian surface vessel with a Loud pulse producer like an acoustic tag with a Distic Aquistic Signiture Large enough to be Noticed that would alert any Sub of any surface vessels!!

Ryan mate Close call who would of thought on a beautiful day like (a Typical fishing day) that a bIg Gigantic Sub would of emerged on that day :alian

 

[Ryan]

It was such a shock we just stood there watching it,about ten minutes afterwoods we realised that we had a camera. What a missed photo oppurtunity. :?