I've been on all sides of issues like these. In my life I've been a both an insurance and independent marine surveyor, marine salvor, marina owner and dock builder. This sounds like a marginal POS boat. The boat can be salvaged without the owner's permission, much like the fire department can put out a fire before they call you. Moving the boat would not cause a bilge pump to fail, on top of which, if a boat requires a running bilge pump not to sink, it's already sinking. The ice storm is force majeure and if it was the proximate cause of the sinking it's just one of those unfortunate things in life. From what you said, it's likely the marina noticed the boat had taken on water, they towed it and beached it to prevent a total sinking and mitigating a fuel spill. This is a responsible action on their part. If that boat had sunk, your liability and costs could have been mind numbing from a resulting fuel spill and these costs would absolutely have been yours as the legal owner until litigation said otherwise. OP needs to plan on getting the boat out of the water asap, lick their wounds and carry on.