 In 1997 " Stay Behind Cave " ( as it was nicknamed ) was discovered in Gibraltar by the Gibraltar Caving Group , but no account was ever obtained from anyone associated with the mission . The discovery came about when the group encountered a strong gust of wind in a tunnel . Further searching led them to break through a wall into chambers which had never been used and had remained sealed for over 50 years . 
 In 1997 " Stay Behind Cave " ( as it was nicknamed ) was discovered in Gibraltar by the Gibraltar Caving Group , but no account was ever obtained from anyone associated with the mission . The discovery came about when the group encountered a strong gust of wind in a tunnel . Further searching led them to break through a wall into chambers which <a href='been_done' title='1'><mark>had</mark></a> never been used and <a href='been_done' title='2'><mark>had</mark></a> remained sealed for over 50 years . 
In 1997 " Stay Behind Cave " ( as it was nicknamed ) was discovered in Gibraltar by the Gibraltar Caving Group , but no account was ever obtained from any1 associated witt da mission . Tdadiscovery came about when the group encountered a strong gust of wind in a tunnel . Further searchin led them to break through a wall into chambers which done never been used and done remained sealed for ova 50 years .