The signal of some new LF NAVY transmitter was observed today (6 May 2018) on the frequency of 36 kHz from 18.00 till 18.22 UTC (closing down). I didn't find any information about some facilities on this QRG in Internet.
The same signal was also visible on Twente web-SDR with much higher level, so I guess, it's from somewhere in Western Europe.
Update: according to info in some old frequency bases, it could be German navy station DHO37, Burlage.