Former NTSB, Jim Hall - first to speculate there is possibility it could be criminal activity.
The Costa Brava is hugely popular with German and British, who take there annual fortnightly vacations there..Spain is very inexpensive by comparison. I was stationed in Barcelona from 70-72...I lived in a little beach town..Castelldellfels..outside Barcelona..during the winter the population was about 3,000..in the summer months..over 20,000...think Jersey shore..
Criminal activity - as if someone was trying to steal it or maybe someone took too much of a depreciation expense in tax evasion.