I attempted to add what is for me a fairly substantial amount of ETH and UBT to the v1 liquidity pool (which I already had a small position on). The tx ultimately ended up failing, and though the UBT still remains in my wallet, the 0.5791 ETH portion has disappeared from my wallet and doesn't seem to be accessible. There is a Retry Transaction button at the bottom of the failed TX but I am afraid to push it for fear of losing even more Ethereum.

How would I go about recovering the Ethereum that has seemingly been lost to this contract or is that even possible?

Here is the tx on the blockchain for reference.
https://etherscan.io/tx/0x178a1b9b783b908019d39ee2da7e4df4f3f1bd06a490d3a937a713572f6a6224