Originally posted by The Usual Suspect
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Just the one answer, making a vessel capable of going into harms way in terms of mines is very, very, very (excuse the emphasis) expensive and complicated, even more so if it is a retrofit. All critical equipment (and that includes the crew, engines, diesels and even the canners/heads) needs to be shock-mounted to survive the accelerations involved, especially with influence mines (peaking at accelerations of over 8000m/s2 as per attached study). I have had the dubious honour of watching US DoD films of tests conducted post-war which included the use of corpses as crash-test dummies weren't around in those days. The slow motion pictures were horrific and mainly consisted of the bone structure exiting the soft tissue at a fair rate of knots. So, as robust and fine ships as the P50s and P60s are, you don't want to be going into mine country with them.
So, either go whole hog and be prepared to spend at least 2-3 times what was spent on each P60 on each full-blown MCMV or stick to basic offboard systems and accept that the main role of the vessel is patrol.
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