Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Colliery | Location | Date | Year | Death toll | cause |
| --- | --- | --- | --- | --- | --- |
| Dinas Colliery | Dinas | 1 January | 1844.0 | 12.0 | gas explosion |
| Cymmer Colliery | Cymmer | 15 July | 1856.0 | 112.0 | gas explosion |
| Ferndale No. 1 Pit | Blaenllechau | 8 November | 1867.0 | 178.0 | gas explosion |
| Ferndale No. 1 Pit | Blaenllechau | 10 June | 1869.0 | 53.0 | gas explosion |
| Pentre Colliery | Pentre | 24 February | 1871.0 | 38.0 | gas explosion |
| Tynewydd Colliery | Porth | 11 April | 1877.0 | 5.0 | flooding |
| Dinas Middle Colliery | Dinas | 13 January | 1879.0 | 63.0 | gas explosion |
| Naval Colliery | Penygraig | 10 December | 1880.0 | 101.0 | gas explosion |
| Gelli Colliery | Gelli | 21 August | 1883.0 | 5.0 | gas explosion |
| Naval Colliery | Penygraig | 27 January | 1884.0 | 14.0 | gas explosion |
| Maerdy Colliery | Maerdy | 23–24 December | 1885.0 | 81.0 | gas explosion |
| National Colliery | Wattstown | 18 February | 1887.0 | 39.0 | gas explosion |
| Tylorstown Colliery | Tylorstown | 27 January | 1896.0 | 57.0 | gas explosion |
| National Colliery | Wattstown | 11 July | 1905.0 | 120.0 | gas explosion |
| Cambrian Colliery No.1 | Clydach Vale | 10 March | 1905.0 | 34.0 | gas explosion |
| Naval Colliery | Penygraig | 27 August | 1909.0 | 6.0 | cage fall |
| Glamorgan Colliery | Llwynypia | 25 January | 1932.0 | 11.0 | firedamp |
| Blaenclydach Colliery | Clydach Vale | 25 November | 1941.0 | 7.0 | runaway trolly |
| Lewis Merthyr Colliery | Trehafod | 22 November | 1956.0 | 9.0 | gas explosion |
| Cambrian Colliery | Clydach Vale | 17 May | 1965.0 | 31.0 | gas explosion |
Question:
Which Colliery has a Death toll of 7?
Answer:
Blaenclydach Colliery