All due respect gestalt but I don't think the words "punk" and "folk" can be put into the same sentence let alone next to each other.
I think what Ian K posted is a soulful lament rather than a sea shanty.
Certainly a "Sea Shanty", to be meaningful and by definition, must be traditional in nature and delivery.
Sailors prefer simplicity above all else as dealing with the moods of the sea is not usually simple.
The following song is a sea shanty that is on an album, a copy of which on vinyl I bought in Cairns in 1972 in mint condition and I still have.
Dave Van Ronk is one of the legends of American folk music and a contemporary of Woodie Gutherie among others.
Bit of crackle from the vinyl record but otherwise great.
Also performed and recorded by a more contemporary artist, David Bowie with a slightly different character to it.
Same song in what sounds like Russian or Polish.