I've been trying to remember which racing yachts have been lost down there! Vestas is a very likely candidate. Pretty sure that you're looking at a hull panel with a lower rudder bearing, and then the rudder stock and some or all of the top bearing. The white tiller is probably semi custom made to take a pushrod connecting to the steering pedestal.
Have a look at the rebuild video
Team Vestas Wind Makes Progress as Hull Form Comes Together - gCaptain at 1:10 and you'll see the replacement aft hull with one of the lower rudder bearing mounts just behind the narrator's back. The distinct circular reinforcement is quite clear. You can also both rudder bearings from behind in the title page of the video.
And here
Dongfeng breaks rudder on leg 1 of Volvo Ocean Race | The Daily Sail is the 'tiller' on her sistership, Dongfeng.
