The third-largest stablecoin by market cap, TerraUSD (UST), appears to be in a catastrophic tailspin which has seen it depeg from the dollar and drop to as low as $0.67 on Tuesday.

As its price has fallen, so has its market capitalization along with that of LUNA, which backs the majority of the value of UST. Adding further insult to injury, the market cap of UST has vastly surpassed that of LUNA, drawing extreme scrutiny from the crypto community.

UST price chart from CoinGecko

As of the time of writing, the UST price is $0.78 with a market cap of $14.1 billion, while LUNA has been in a freefall, collapsing to $35.07. This has caused massive liquidations on leveraged positions, dropping its market cap to $12.3 billion, according to CoinGecko data.

If the market cap of LUNA is lower than UST, it is possible that there are not enough funds in the Terra project to properly back the value of the algorithmic stablecoin and maintain its peg.

The Luna Foundation Guard (LFG), which is in charge of ensuring UST maintains its peg to the  United States dollar, has been in damage control to try to mitigate any further losses and return the stablecoin to $1.00.

Its strategy of acquiring Bitcoin (BTC) to collateralize UST has not yet had a positive impact in the face of several factors. Cointelegraph reported that a whale began dumping $285 million worth of UST started Saturday, causing the stablecoin to drop to $0.98 and LUNA to drop to a three-month low of $61.

As LUNA price and the UST peg itself looked unstable, the LFG deployed $1.5 billion worth of BTC on Monday as a means of adding much-needed liquidity to the ecosystem. The LFG loaned out coins to trading firms “to protect the UST peg” and 750 million UST tokens to accumulate BTC.

The LFG held about 167,081 BTC, worth roughly $3.5 billion as of Friday when it announced it had acquired an additional 37,863 BTC.

Terra founder Do Kwon appeared unperturbed by the market effects as late as six hours prior to the time of writing, tweeting, “Deploying more capital - Steady lads.” Shortly after, Cointelegraph reported Tuesday that the LFG moved 42,500 coins to various destinations, including the OKX crypto exchange. There has not since been word from Kwon.

Related: LFG to deploy $1.5 billion to bolster UST peg and build BTC reserves

However, the notion that BTC could be a viable backing for a dollar-pegged stablecoin is being tested to its limits. In the same time period from Thursday to Tuesday, the BTC price has dropped about 25% from $39,874 to $30,269, according to CoinGecko data.

The LFG’s constant tinkering with UST has drawn the ire of proponents of decentralization, such as the strategy lead at Hasu, who tweeted on Tuesday that “I don't want people to call UST decentralized again.”

At the time of writing, UST was 22% down from $1.