Death is part of Space Abyss. It will be normal to go down a hole and die, or attack something that is surpisingly strong
What Happens When You Die?
It it recommended that if you are exploring a new place, use a secondary body that you won't be as upset if it gets killed. You can then guage whether to use your strongest body to try and recover what you lost depending on if you instantly died, or you had a chance. You can build extra bodies in a Cloning Vat