karl, Spectra comes on spools and is sold in various sizes in fishing tackle
shops.

I wouldn't worry too much about Spectra cutting through a metal chock in even
an extended storm. If *you* are worried about that happening, use braided line
to parcel and serve, because braided line had much less stretch, and you are
using the braided line as a safety line, aren't you?

besides, put the wormed, parceled, served with Spectra line inside the fire
hose you recommend the line first has to "cut through" (your term) the fire
hose ("arguably the finest chafe gear available" according to you) and THEN cut
through the metal chock and THEN through the boat's deck and THEN through the
boats hull to finally make the boat come free.

If all that happens, karl, you just gotta figure when your number is up your
number is up. God is just out to get ya, dood.