Refer to figure.
According to the regulation stated below, the pilot is required to use the frequency that is currently in use. In this scenario, we can assume that the pilot has already switched to the tower frequency, as such frequency changes are typically implemented promptly. The tower frequency can be found at the top of the attached chart: 118.150 (one one eight decimal one five zero).

ICAO Annex 10, Volume II
5.3.2.1 Action by the aircraft in distress

5.3.2.1.1 In addition to being preceded by the radiotelephony distress signal MAYDAY (see 5.3.1.2), preferably spoken three times, the distress message to be sent by an aircraft in distress shall:

a) be on the air-ground frequency in use at the time;
b) consist of as many as possible of the following elements spoken distinctly and, if possible, in the following order:
1) name of the station addressed (time and circumstances permitting);
2) the identification of the aircraft;
3) the nature of the distress condition;
4) intention of the person in command;
5) present position, level (i.e. flight level, altitude, etc., as appropriate) and heading. Bottom of Form