So I designed a nuclear powered probe mothership; built for going to Jool and probe it's moons (...)
However the thing had a few "flaws" and tended to blow up during launch, but my 7:th ship got away from Kerbal and intercepted Jool. Sadly its fuel ran out so it couldn't enter into an orbit around Jool. I launched its 3 probes thinking that they might carry on but they turned out to be flawed as well.
One probe lost it's engine and the other two suffered from a design flaw; I had attached docking ports to the engines, thinking they would work like decoupelers. they don't. so all 3 probes were lost as well.
Right, so new day and a slight redesign to the ship, making it lighter and fixing the probes. Managed to get it off Kerbin on the second try and sent it off to Jool.
Sadly this one ran out of fuel as well while trying to make Jool orbit. Launched the probes, but got confused because the prograde/retrograde vectors had been reversed so I sent one probe away from the planet losing it in the process.
The two remaining probes on the other hand entered orbit and begun closing in on the planet. My main goal was to land on Laythe, the ocean covered moon. Probe two ran out of fuel trying to enter Laythe orbit and ended up being flung out of Jool orbit after being slingshoted by one of the moons.
Probe 3 on the other hand got closer to Laythe.
But sadly this was as close as it ever got; the fuel wouldn't be enough to get it into orbit or land. However this probe ended up going right for Jool instead.
View of Lathe from Jool atmosphere. In the end the probe descended until it reached sea level when it continued to descend and descend almost 100m below sea level (it is a gas giant after all) when the probe exploded; either from the temperature reaching 1000 degrees or the pressure passing 16.