It is also relevant to note that the sea temperature at the time of the incident was a relatively mild 10.5º Celsius. Even in these conditions, it is estimated that 1/3 of all those that escaped the sinking ship, died of hypothermia before rescue vessels and SAR helicopters arrived on scene around 1 hour after the Estonia sank. Compare this to the Surface Sea Temperatures found around the higher latitudes in Spring, where sea temperature range from zero to around 6º Celsius. At those temperatures, humans with no thermal protection will typically die from cold injuries within 15 – 60 minutes. These facts remind us that even when people are able to escape from a sinking vessel, the threat to their survival is far from over. In the case where sea temperatures are 10º or cooler, it is highly likely that people who enter the water will not survive for more than an hour before succumbing to hypothermia and death.