It's undoubtedly filled with mud/silt, so everything inside would need to be dug out as well, after trying to seal whatever breaches the crash caused to keep it from refilling. I don't see any practical way of pulling out the crashed dropship intact, but it should be possible to cordon off and excavate a path to it, then cut through the hull or enter through the bay doors. It would probably take multiple years and cost more than buying a replacement dropship. Then you'd have to build a very deep cofferdam around it, drain the surface water, and begin carefully excavating until you had enough of it exposed to break the suction and lift it out with a VERY big airship. To get it out of that marsh after it sank fully you'd have to fist find it using ground penetrating radar. Very quickly that Leopard is going to be a couple dozen meters below the surface, and the suction of the mud against its surface and weight of the thousands of tons of mud on top of it will make moving it impossible. It ended up so deep under the surface of the mud they had to find it with RADAR.
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Anybody else remember the budget airliner that went down in the Everglades in the 90s? Cause I do. Marshes and bogs will give up small things, but the larger and heavier an object is the more surface area it gives the bog to hold it and the deeper it sinks. You aren't getting it out of the bog, simply not happening. would the Leopard, the mechs inside also buried by the bog, and the Locust parts- mostly legs admittedly- be salvageable if pulled from the bog's depths? I mean we get wooly mammoths that were captured in Siberian bogs and when they re-surface they are viable biological samples. Later in the story three Locusts got mired in the edge before being dispatched by a severely damaged Guillotine. The bog appears to be in at least a temperate zone if not nearing a alpine zone. No mention of damage on the other mech still in it's rack, or what it was, but the two that had fallen into the open part of the bay would be expected to be damaged. Two of the mechs had broken loose and slung around during the crash, damaging the Guillotine's arm.
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BATTLETECH KEEPS CRASHING CRACK
The protaganist managed to escape the sinking Leopard by widening a crack in the hull and jetting his Guillotine through the hole. Shrapnel #5 had a story about a Leopard crashing on a planet and coming down in a bog.