Naturegirl, I suggest you rethink your dive action in Dig, for a few reasons.
First: The explosion elemental isn't biological, so it's unlikely that Biology Sphere will have an effect, though it's p[ossible. I'd ask PW on the Discord about that.
Second: Es is for moving things, not controlling them. You wouldn't be making this thing your friend, you'd be pushing it around, like trying to wrestle a pitbull or something. If you want to control something, Gesh is the action Sphere you are after.
Third: You have 7 Strength and 2 Diving skill, you are rolling against a 9 in the plane of elemental forces - giving you a 60% chance of failure. Additionally, you are rolling against a 10 (8 endurance + 2 diving) for the biological sphere, giving you a 55% chance of failure there. So, between these two, you have roughly an 82% chance to fail the dive.
Fourth: you now have -2 on your Nerve, not -1. That means you are operating at an effective nerve of 11. Add your diving skill, and you are rolling each nerve roll against a 13. This means each nerve roll has a 40% fail rate. With advantage, this number drops a bit though, and can be eliminated with a proper sacrifice, but I don't thin you want to make a sacrifice for something like this. But:
Fifth, and most importantly: You just failed on both your final material roll, AND your final Nerve roll. The final material roll is why you made an explosion elemental (congratulations on that, by the way, it's awesome). The Final nerve fail means you went a litle mad or got a little possessed, as a result of that Dive. your character is the one that suddenly started screaming in the back of the group. You are in no condition to Dive, and in fact are the reason most of the other characters' actions got interrupted this turn.
When an event interrupts a whole bunch of combat related actions, something significant is happening.
Your action this turn should probably be along the lines of "fight against the madness, attempt to regain control," or "try not to hurt anyone while I'm insane."
p.s. welcome to the Dive Fails Club.