An automated storage and retrieval system comprising: - a rail system (108, 50) comprising a first set of parallel tracks (110;51) arranged in a horizontal plane and extending in a first direction, and a second set of parallel tracks (111;52) arranged in the horizontal plane and extending in a second direction which is orthogonal to the first direction, which first and second sets of tracks (110,111;51,52) form a grid pattern in the horizontal plane comprising a plurality of adjacent grid cells, each comprising a grid opening defined by a pair of neighboring tracks (110a,110b; 51a,51b) of the first set of tracks (110;51) and a pair of neighboring tracks (111a,111b;52a,52b) of the second set of tracks (111;52); - a master control system configured to keep track of any remotely operated vehicle (200,300;30) operating on the rail system (108;50); - a plurality of remotely operated vehicles (200,300;30) handling storage containers, the remotely operated vehicles (200,300;30) operating on the rail system (108;50), each of the remotely operated vehicles (200,300;30) comprising: • first and second sets of wheels (201,301;31) for transport in the X and Y directions on the rail system (108, 50), • a fire detection device configured to transmit data from the fire detection device to the master control system, wherein - the master control system comprises a processing device for processing the data from two or more of the fire detection devices such as to create a heat map of the automated storage and retrieval system for providing a firefighting crew with valuable information in terms of location of the fire or smoke and/or the current temperature/temperature profile of the heat- or fume emission. - a rail system (108, 50) comprising a first set of parallel tracks (110;51) arranged in a horizontal plane and extending in a first direction, and a second set of parallel tracks (111;52) arranged in the horizontal plane and extending in a second direction which is orthogonal to the first direction, which first and second sets of tracks (110,111;51,52) form a grid pattern in the horizontal plane comprising a plurality of adjacent grid cells, each comprising a grid opening defined by a pair of neighboring tracks (110a,110b; 51a,51b) of the first set of tracks (110;51) and a pair of neighboring tracks (111a,111b;52a,52b) of the second set of tracks (111;52); - a master control system configured to keep track of any remotely operated vehicle (200,300;30) operating on the rail system (108;50); - a plurality of remotely operated vehicles (200,300;30) handling storage containers, the remotely operated vehicles (200,300;30) operating on the rail system (108;50), each of the remotely operated vehicles (200,300;30) comprising: • first and second sets of wheels (201,301;31) for transport in the X and Y directions on the rail system (108, 50), • a fire detection device configured to transmit data from the fire detection device to the master control system, wherein • first and second sets of wheels (201,301;31) for transport in the X and Y directions on the rail system (108, 50), • a fire detection device configured to transmit data from the fire detection device to the master control system, - the master control system comprises a processing device for processing the data from two or more of the fire detection devices such as to create a heat map of the automated storage and retrieval system for providing a firefighting crew with valuable information in terms of location of the fire or smoke and/or the current temperature/temperature profile of the heat- or fume emission.