  A new trigger for NEMO Phase 2 tower based on the time differences of the PMT
hits has been studied. Such a trigger uses only a fixed number of PMT hits in a
chosen time windows. The background trigger rate is drastically reduced
requiring hits from different PMTs. A 87% trigger efficiency was estimated by
Montecarlo simulation for muon tracks with at least 5 PMT hits. The trigger
rate estimated by Montecarlo was also measured on raw data. The results from
Montecarlo simulations and raw data are reported.
