Amashubhu ensimbi ayizingxenye ezibalulekile emikhakheni yasolwandle nasogwini, lapho izimo zemvelo eziyingozi zidinga izinto ezinikeza amandla akhethekile, ukuqina, nokumelana nokugqwala. Kusukela ekwakhiweni kwemikhumbi kuya kumapulatifomu angasogwini nokufakwa ngaphansi kolwandle, amashubhu ensimbi anika amandla ukwakhiwa nokusebenza kwezakhiwo zasolwandle eziphephile, eziphumelelayo, nezihlala isikhathi eside.