on thursday, 10 august 2017, wall and boyfriend ole stobbe were preparing to host a farewell party in refshaleøen prior to their planned move to beijing on 16 august. before the party, she received a text from entrepreneur peter madsen—with whom she had requested an interview earlier in the year—inviting her to interview him on board his midget submarine "uc3 nautilus". she agreed to join him on the submarine for two hours and boarded "nautilus" around 19:00 local time (). the submarine never returned to the harbour and stobbe called the police at 01:43 that night to report wall missing. the submarine was sighted in køge bay southeast of amager by drogden lighthouse at 10:30 the next morning; it foundered at 11:00.