A submarine comprising a waste gas evacuation system for gases produced in a reformer of said submarine, the waste gas evacuation system having: 1a) an exhaust waste gas inlet to the evacuation system configured to receive exhaust waste gases from a reformer; 1b) a dissolution means inlet to the evacuation system configured to receive the dissolution means; 1c) an outlet from the evacuation system configured to reject the dissolution with the gases dissolved in; characterized in that the waste gas evacuation system comprises: 1d) a reactor-absorber configured to put in contact waste gases with dissolution means, the reactor absorber comprising: 1d1) a slim vessel configured to allow a pass velocity for the dissolution means between 20 and 50 cm/s; 1d2) a first inlet to the vessel which is the waste gas inlet to the evacuation system; 1d3) a distributor of waste gas inside the vessel; 1d4) a second inlet to the vessel which is the dissolution means inlet to the evacuation system; 1d5) a outlet from the vessel configured to reject the mixture of the dissolution means and the waste gas; 1d6) a packing bed inside the vessel, said packing bed being random or structured; 1e) a calm down vessel located downstream the reactor absorber, configured to obtain an effective dissolution, the calm down vessel comprising: 1e1) a vessel configured to allow a near laminar flow regime for the dissolution means and a residence time of at least 100 seconds; 1e2) an inlet of the mixture coming from the reactor-absorber to the vessel; 1e3) an outlet from the vessel which is the dissolution outlet which comprises the dissolved gases into the dissolution means from the evacuator. 1a) an exhaust waste gas inlet to the evacuation system configured to receive exhaust waste gases from a reformer; 1b) a dissolution means inlet to the evacuation system configured to receive the dissolution means; 1c) an outlet from the evacuation system configured to reject the dissolution with the gases dissolved in; characterized in that the waste gas evacuation system comprises: 1d) a reactor-absorber configured to put in contact waste gases with dissolution means, the reactor absorber comprising: 1d1) a slim vessel configured to allow a pass velocity for the dissolution means between 20 and 50 cm/s; 1d2) a first inlet to the vessel which is the waste gas inlet to the evacuation system; 1d3) a distributor of waste gas inside the vessel; 1d4) a second inlet to the vessel which is the dissolution means inlet to the evacuation system; 1d5) a outlet from the vessel configured to reject the mixture of the dissolution means and the waste gas; 1d6) a packing bed inside the vessel, said packing bed being random or structured; 1d1) a slim vessel configured to allow a pass velocity for the dissolution means between 20 and 50 cm/s; 1d2) a first inlet to the vessel which is the waste gas inlet to the evacuation system; 1d3) a distributor of waste gas inside the vessel; 1d4) a second inlet to the vessel which is the dissolution means inlet to the evacuation system; 1d5) a outlet from the vessel configured to reject the mixture of the dissolution means and the waste gas; 1d6) a packing bed inside the vessel, said packing bed being random or structured; 1e) a calm down vessel located downstream the reactor absorber, configured to obtain an effective dissolution, the calm down vessel comprising: 1e1) a vessel configured to allow a near laminar flow regime for the dissolution means and a residence time of at least 100 seconds; 1e2) an inlet of the mixture coming from the reactor-absorber to the vessel; 1e3) an outlet from the vessel which is the dissolution outlet which comprises the dissolved gases into the dissolution means from the evacuator. 1e1) a vessel configured to allow a near laminar flow regime for the dissolution means and a residence time of at least 100 seconds; 1e2) an inlet of the mixture coming from the reactor-absorber to the vessel; 1e3) an outlet from the vessel which is the dissolution outlet which comprises the dissolved gases into the dissolution means from the evacuator.