The present invention relates to a system, method and software for monitoring a diver comprising: a topside monitoring system 13 on a vessel comprising a receiver for receiving data from at least one diver 12, the data being transmitted using an acoustic modem 207 and specifying information relating to the diver 12, wherein the information relating to the diver comprises the depth of diver, a computer for processing the data 101, and a user interface 111 for conveying the information and the elapsed time of dive to a dive supervisor so that the dive supervisor can manage the dive.
