You don't, unless you kill the Ampeel

The second wreck, not the one in this pic but the other one; One playthrough I was wanting to simply swim down with the seaglider with my seamoth above the 4, yes 4 ampeels that for some strange reason wouldn't leave the damn area. They kept circling it (the wreck and its yard). Other times that I've explored the wreck, one or 2 linger but hardly that close to the wreck. So this time around I decided to just whizz past them the best I could without getting shock or bitten and I made it safely in the wreck, however it was like the walls on the wreck were not there because one the eels managed to both zap and bite me through the wreck's walls.

And when I was exiting, it was such bad timing, this same ampeel was swimming directly into the door frame and a second time it got me with both attacks.

First time in a very long time did my heart start to beat faster over this game I and lost my cool shooting wildly at the ampeel with my stasis gun and then I was able to flee. I now never have explore those wrecks, I can find all their blueprints in much safer biomes than this biome.

But related to post - Couldn't you repulsion cannon it out of the way? I think there is another entrance in that wreck, underneath.