The British Justice Ministry is apparently investigating “all viable options” to help a prison system that is “on the point of collapse,” The Daily Telegraph reported. A government source cited by the paper said the option of sending prisoners to Estonia “was on the table” because of the seriousness of the problem gripping the jail system.

The U.K.’s prison system is nearing capacity, with only 83 spaces left in men’s prisons. Estonia, however, has half-empty jails due to low crime rates, and this lack of convicts has prompted the Estonian government to rent out surplus space..

Following a meeting of European justice ministers on Thursday in Vilnius, the Lithuanian capital, Liisa Pakosta, the Estonian Justice Minister, told The Telegraph: “The U.K. and Estonia have a history of successful international co-operation, and such a partnership would create further opportunities to benefit and learn from each other.”.

Initially proposed by Alex Chalk, a justice secretary in a former Conservative government, the plan to rent out foreign prison cells faced criticism from Labour, then in opposition, and the Prison Reform Trust. However, Labour is now reconsidering it, despite concerns about costs like flights and staffing..

Renting prison space abroad is not new in Europe, with Norway and Belgium leasing cells from the Netherlands, but Estonia’s offer is seen as a more affordable alternative..

Estonia’s government has yet to approve the plan, but Pakosta indicated that other nations are also interested in renting prison space.