Deribit Extreme Put Skew

I am watching Deribit, and 8000P expiring in 11 1/2 hours is 0.0005 bid for 100 contracts. This just ticked to be 200% vol. While we've seen these levels back in March, that was then. Either someone is really nervous about almost 1300 point drop, or forgot that they have an active order and went to sleep :)
And ... it did not last too long, I think someone was also watching this strike vol creeping up and as I was writing the post lifted all bids on the line.

Update: 7.5 hours left, and buyer is back with 600 contract bid at 250% vol. What is going on? Does someone knows something others don't?  Is someone forced to hedge margin? There certainly not many sellers left.

Update: And the contracts traded; markets @ 0.0005 x 38

Final update: Expired far far otm. 

Expiration Dates For VSTOXX, VNKY, RTSVX, VHSI

For anyone tracking all domestic and international volatility futures I put together this guide. Email me if I am missing a contract

• CBOE: expiration is 30 calendar days before options expiration, Wednesdays, AM special opening quotation. Source.
• VSTOXX/EUREX: expiration is 30 calendar days before options expiration, most of the time same day as CBOE, Wednesdays, settled to an average index value between 11:30 and 12:00 Central European Time. Source. 
• EURO STOXX 50 Variance Futures/EUREX: One business day before the third Friday of the maturity month; settlement based on the average of the EURO STOXX 50® index calculations between 11:50 and 12:00 CET on the third Friday of the maturity month. Source.
• RTSVX/MOEX: expiration is 7 calendar days before options expiration (which is around 15th of the month). Settled to the average index value of the evening trading session. Source.
• VHSI/HKEX: 30 calendar days prior to the second last business day of the next month, settled to the average of the last half hour. Source, source.
• VNKY/OSAKA: last trading day is the day preceding the day that is 30 days prior to the 2nd Friday of each month, Tuesdays. Source, source.
• INDIA VIX/NSE: weekly contracts, expiring on Tuesdays. Source.
• V-KOSPI/KRX: day after 30 calendar days prior to the following month's KOSPI200 options last trading day. Source.
• AVIX/ASX: expiration is 30 days prior to the third Thursday of the following calendar month, generally day before CBOE volatility expiration; settling into the average value of the S&P/ASX 200 VIX between 11.30am and 12.00pm on that day. Source, source.