In a submarine just submerge eventualy the wieght will pull it down, if your talking about FFG-7 then once the ice becomes too thick the only way you can get back out is either with an ice breaker or reversing, this in itself is tricky seeing as the ice can wrap around the back end very quick and then your jammed in tight.
pack ice try to avoid it but you can smash it just hit it head on dont hit it using the sides.
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