I've seen 70s-era pics of it decaying in the Fox backlot.
I've always been crazy about the Proteus sub used in
Fantastic Voyage. After the
Cleopatra disaster, FOX got particularly anal about re-using props to keep costs down. So when Irwin Allen -- himself no slouch at re-using stuff -- needed a rescue sub for the climax of
The Poseidon Adventure, they painted the Proteus yellow. But in the end, there wasn't budget enough for those scenes and given that they'd trashed the sub anyway, went ahead and scrapped it.
There's a great story somewhere* on the interwebs about a couple of fans gaining access to the FOX backlot and being able to climb around and photograph full-scale pieces like the Spindrift from
Land of the Giants, the
Lost in Space Jupiter II (which was already effectively scrap at that point), and more. Among the things they found was the
Apes ship, which by then was also in pretty sad shape. They went on to write that on a return trip hoping to get some better shots, they were informed that everything had by then been cut-up and hauled off.
This is one of the last known pics of the "icarus":**
*Can't find the article; likely it was on AOL HomeTown or Geocities; I do find posts from other asking where it went.
**Turns out the ship never actually had a name; the guys who found the rusted prop are the one who dubbed it Icarus!