Out of the Submarine Fog

[Color, bold and underlining added for my own emphasis]

(1) Pride

A matter of pride, as well as an empirical fact...

"Israel Navy’s submarine service – For the best, but not for everybody" - says top recruiter.

 “We look for very special people,  a submarine is not for everybody. Errors cannot be made, because of the lives at stake, the important work, the cost – some half-a-billion euros per submarine – and even the diplomatic importance. Doing the wrong thing could lead to a declaration of war on Israel.”  - Lt.-Cmdr. Yohai Zeidman, a psychologist

(2) Silence & Stealth

Fisherman spooked after close shave with unidentified submarine off the coast of Donegal... 

 “We were just lucky to have come across it after it had surfaced.” - John Cunningham, fishing from Killybegs

"In recent years there has been much speculation linking the sinking of fishing trawlers with submarine activity in the area." - Bernard Moffatt, Celtic League Director of Information.   
 
Mr. Moffatt said that from a photograph (not the one above) of the submarine sent to him he was 99% certain it was a Royal Navy Astute class hunter-killer.

(3) No Worries? Cesium-137 Threat to Fisheries

What Threat do Sunken Nuclear Submarines Pose to Fisheries? Dumped radioactive waste and sunken nuclear subs cause radioactive contamination in the Arctic marine environment. Researchers irecently nvestigated the potential effects of leakages from two sunken submarines, containing large amounts of caesium-137 (an isotope with a half life of 30 years) with a potential to accumulate in cod and capelin. 

Researchers evaluated cesium-137 from the sub K-278 Komsomolets, which sank in the Norwegian Sea in 1989, and the K-159 that sank in 2003. Two scenarios were assumed: (i) continuous release of cesium-137 over a five-year period, and (ii) a single, 100% release equal to 100% of cesium-0137 in the subs at time of sinking. 

Neither scenario theoretically raised radioactivity in cod or capelin to levels considered dangerous by Norway's government. However, a hypothetical single release of 100% of the cesium-137 from K-159 would raise concentrations in cod to a hundred times their current level within two years after leakage. 
  
Researchers noted a need for further research to assess effects on the larger ecosystem.

Submarines are always silent and strange.

dumping of radioactive waste and sunken nuclear submarines all cause radioactive contamination in the Arctic marine environment. In this study, researchers investigated the potential effects of leakages from two sunken submarines, which contain large amounts of caesium-137. This radioactive isotope decays very slowly, with a half life of 30 years, and may accumulate in the body tissues of marine organisms. - See more at: http://www.thefishsite.com/fishnews/22098/what-threat-do-sunken-nuclear-submarines-pose-to-fisheries#sthash.HMatLBZs.dpuf