Underground electrical box?

Question

The picture shows the spot in my front yard where an outlet used to be. There is a fourth wire not visible in the picture. We have since brought the  grade down about two feet and it no longer makes sense for us to have an outlet there as it would be in the middle of a patio-type space. The space will mostly likely have a gravel covering. The wires feed outdoor street lights which cannot be sacrificed.
I don't suppose I could make the junction underground - or can I?
Assuming I can't, what are some of the alternative solutions that are not a complete eyesore?

Update: for all the good answers I received, I cannot find a device for making a waterproof 4-way underground splice.

Ed Beal · Accepted Answer

You can have junctions underground. If that cable is underground rated it can be done without a box if buried to code. A junction box could be located and underground splices can be used the big deal is a splice that seals inexpensive kits are under 20$ 3-4 wires the terminal block and the heat shrink , easy to do and code compliant big box stores usually have the kits.

Correct answer by Ed Beal on September 11, 2020

Ecnerwal · Answer

The other option is to put in a "hand-hole" so called - you've walked over them, some you have driven over (those ones cost more). They are (generally) like a box missing the bottom, with a removable top, and you set them over the conduits so the top is flush with the ground surface. You still need a waterproof splice method, but if you ever need to access it again it's a whole lot easier to find. The drive-over ones are usually made of concrete, the others are commonly plastic.
If you have "brought the grade down two feet" I'm wondering how much cover your conduit (or is that water pipe being used as conduit?) now has.

Underground electrical box?

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