I got these images second hand (perhaps third, forth, or fifth hand), so I can’t say where they came from or the date taken, but I think they are instructive for how they show how a vessel can be much more than it appears. Reportedly, this is a Russian trawler that was stationed off the Fleet Ballistic Missile Submarine base at Holy Lock, Scotland. That they were not there to fish was general knowledge, but I think the extent of modifications to the underwater body, particularly the apparent addition of torpedo tubes, may be a bit of a surprise.
Looking a bit closer:
(Thanks to Robert Stoner and Tim Wind)
Chuck Hill's CG Blog 
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No Comade, not torpedo tube, cooling water intakes for environmental safe fish frezzer. Americans, always suspicious da?
I could be off, but that sure looks like the sonar bulb off a Foxtrot grafted under the bow. Which probably means, with the surface churn, this thing would have trouble hearing KISS live in concert unless they were sitting in the first 20 rows.
I remember on a few ship inspections that I was on a few of the better qualified inspectors found some pretty unique ways ships disguise things as other functions. Bill’s comment reminded me of their response when questioned on these unusual piping arrangements.
I remember the “innocent” fishing trawlers we encountered in the Med and Black Sea during a 1965 cruise. They had so many antenna they looked like porcupines. In the Black Sea the trawlers would rig huge “battleship” fenders on each stern quarter. They would run ahead and the go DIW in front of the other destroyer, USS Corry, with us. For some reason they did not mess with us. Cool times.
The Soviet Navy would also send small DE-style destroyers to nose up in the wake of two ships refueling while underway. They had several film cameras recording the procedures. Learning underway refueling was pretty important technology to them.
Sometimes, it is the simple things.
yea, they were still following us around in the med in the early 80’s. i think, not sure, that they still unrep from the stern. come to think of it though i’ve seen very little about russian unrep. of course i wasn’t really looking too hard.
I don’ think that is a torpedo tube…I think it’s a diver lockout access point.
I think it would be an odd place to put a diver lock out. I would put it on the bottom.